# 8th Workshop of the APS Topical Group on Hadronic Physics

10-12 April 2019
Denver, CO
US/Mountain timezone
Home > Contribution List

## Contribution List

Displaying 124 contributions out of 124
Type: contributed talk Session: Production and Decays
The interacting three-particle states are populated via an interacting two-particle sub-system (resonant or non-resonant), and a spectator. Using this formulation, we derive the relativistic isobar-spectator amplitude such that the three-body Unitarity is ensured exactly (*arXiv:1706.06118*). Unitarity constrains the imaginary parts of such an amplitude in infinite volume. In the finite volume ... More
Presented by Dr. Maxim MAI on 11 Apr 2019 at 17:05
Type: invited talk Session: Nuclear PDFs
While tremendous effort has been made to determine the parton distribution functions (PDFs) of a free proton, less is known about their modification in nuclei. Such information is vital for our understanding of parton dynamics, since it can provide valuable insight into nuclear effects that are not well understood. In this talk, I present nNNPDF1.0, the first analysis of nuclear PDFs from the NNPD ... More
Presented by Jacob ETHIER on 10 Apr 2019 at 14:50
Type: plenary talk Session: Plenary
Why quarks cannot be separated far enough to be observed in isolation remains a major unresolved question in hadronic structure: What are the types and strengths of the interactions that keep the colorful, asymptotically free, partons of short distance, high energy perturbative QCD confined inside colorless entities like mesons and baryons? One step towards the answer is the study of quark-gluon ( ... More
Presented by Dr. Oscar RONDON ARAMAYO on 12 Apr 2019 at 14:00
Type: contributed talk Session: Production and Decays
In the first part of this talk, we present an analysis of the $\eta^{\prime}\to\eta\pi\pi$ decays within the framework of $U(3)_{L}\times U(3)_{R}$ ChPT including resonance states and the complete one-loop corrections. The amplitude is projected in partial waves and unitarized by means of the $N/D$ method resumming both the important $S$-and $D$-wave $\pi\pi$ and the subleading $S$-wave $\pi\eta$ ... More
Presented by Dr. Sergi GONZÀLEZ-SOLÍS on 11 Apr 2019 at 16:45
Type: invited talk Session: JPAC
In this talk we will present the formalism of Khuri-Treiman equations and how this is useful for the analysis of three body decays. We will show how it works in different reactions, and discuss some of the necessary generalizations, such as the inclusion of coupled channels. We will also discuss future applications.
Presented by Dr. Miguel ALBALADEJO on 12 Apr 2019 at 11:00
Type: contributed talk Session: Production and Decays
The MOLLER experiment proposed at the Thomas Jefferson National Accelerator Facility plans a precision low energy determination of the weak mixing angle via the measurement of the parity-violating asymmetry in longitudinally polarized beam electron scattering on the unpolarized electrons in a liquid hydrogen target (Møller scattering). The scattered electrons are measured by a circular array of t ... More
Presented by Cameron CLARKE on 10 Apr 2019 at 15:25
Type: invited talk Session: 3D Imaging
Major progress in theoretical formalism of the interior structure of the Nucleon over the last 30 years has led to breakthroughs in our understanding of the theory of the fundamental substructure of the protons and neutrons. At the same time, the technical advances in particle accelerator and state of the art experimental detection technologies along with dramatic developments in computing power a ... More
Presented by Latifa ELOUADRHIRI on 11 Apr 2019 at 14:00
Type: plenary talk Session: Plenary
Despite the successes of the Standard Model of particle physics, it remains a challenge to understand the dynamics of the strong interaction among quarks and gluons. At small distance scales or at high energies, the underlying theory, the Quantum Chromodynamics (QCD), is well tested and understood. Our understanding of the strong interaction deteriorates dramatically at larger distances scales suc ... More
Presented by Dr. Johan MESSCHENDORP on 11 Apr 2019 at 09:30
Type: contributed talk Session: Nuclear and Heavy Ion
In a rapidly evolving quark-gluon plasma, local rest frame momentum distributions can largely deviate from isotropic equilibrium statistics. In recent years, progress in the realization of an anisotropic hydrodynamic description beyond the linear viscous corrections has set the stage for further investigating the collective properties and the role of plasma instabilities at earlier stages of the ... More
Presented by Mr. Babak SALEHI KASMAEI on 10 Apr 2019 at 14:40
Type: plenary talk Session: Plenary
Collinear distributions such as PDFs and fragmentation functions (FFs) have long been constrained by independent global QCD analyses. However, it is well known that these functions are intimately related across various scattering processes used in global fits, particularly in the polarized sector. Recently, the JAM collaboration performed the first simultaneous analysis of spin-dependent PDFs and ... More
Presented by Jacob ETHIER on 12 Apr 2019 at 14:30
Type: invited talk Session: 3D Imaging
The recent detection of gravitational waves from merging neutron star events has opened a new window on the many unknown aspects of their internal dynamics. A key role in this context is played by the transition from baryon to quark matter described in the neutron star equation of state (EoS). In particular, the binary pulsar observation of heavy neutron stars requires appropriately stiff dense ... More
Presented by Prof. simonetta LIUTI on 11 Apr 2019 at 15:15
Type: invited talk Session: GPDs
Generalized Parton Distributions (GPDs) have become a major topic in the field of hadronic physics and nucleon structure. They parameterize the momentum of the quarks and gluons momentum in correlation with their spatial distribution inside the nucleon, which provides a three-dimensional picture of the nucleon. This feature makes GPDs a powerful tool to study the orbital momentum of partons inside ... More
Presented by Dr. Eric FUCHEY on 11 Apr 2019 at 16:00
Type: contributed talk Session: Production and Decays
We carried out the experiment E12-17-003 at Jefferson Lab in November 2018 by using the 3H(e,e’K+)Λnn reaction with the high quality CEBAF electron beam and the Hall A high resolution spectrometers. The goal of the experiment is to search for the possible Λnn three-body resonance. If such a resonance exists, it may provide, for the first time, experimental information that can be used to deter ... More
Presented by Bishnu PANDEY on 10 Apr 2019 at 15:05
Type: invited talk Session: JPAC
The Khuri-Treiman (KT) formalism has been used to great effect to describe the low-energy dynamics involved in relativistic three body decays. This dispersive framework relies on truncating the infinite sum of partial waves via the isobar decomposition and imposing unitarity on the three resulting subchannels. Because of this truncation, however, the dispersion equations resulting from unitarity a ... More
Presented by Mr. Daniel WINNEY on 12 Apr 2019 at 11:30
Type: invited talk Session: Beam Energy Scans
We present a fully three-dimensional model providing initial conditions for energy and conserved charge density distributions in heavy ion collisions at RHIC Beam Energy Scan (BES) collision energies [1,2]. The model includes the dynamical deceleration of participating nucleons or valence quarks. It provides a realistic estimation of the initial baryon stopping during the early stage of collisions ... More
Presented by Mr. Chun SHEN on 11 Apr 2019 at 16:00
Type: contributed talk Session: GPDs
The energy-momentum tensor (EMT) encodes information about how energy, momentum, forces, and angular momentum are distributed within a particle. Recent work has been done to explore the rich and unique structure contained in the EMT of spin-1 hadrons. This includes the derivation of a new collection of sum rules relating gravitational form factors to conservation laws, multipole moments, and gener ... More
Presented by Dr. Adam FREESE on 11 Apr 2019 at 16:50
Type: plenary talk Session: Plenary
Exciting new measurements have produced strong evidence for small quark-gluon plasma droplets produced in collisions of protons and small nuclei on large nuclei as well as in proton on proton collisions at RHIC and the LHC. We detail a subset of the most exciting results and discuss the different theoretical interpretations. We highlight the broader physics implications of these observations.
Presented by Prof. James NAGLE on 10 Apr 2019 at 09:00
Type: contributed talk Session: PDFs
The degrees of freedom observed in hadronic collisions at high energies can be  strongly entangled with the rest  degrees of freedom in the initial light cone hadronic wavefunction. The coherence of the incoming hadron is destroyed by the interaction with the target; this may lead to the transformation of   the entropy associated with the entanglement into the thermodynamics entropy of produced ... More
Presented by Mr. Haowu DUAN on 10 Apr 2019 at 16:20
Type: contributed talk Session: GPDs andTMDs
Exclusive meson electroproduction at different squared four-momenta of the exchanged virtual photon, Q^2, and at different four-momentum transfers, t and u, can be used to probe QCD's transition from hadronic degrees of freedom at long distance scale to quark-gluon degrees of freedom at short distance scale. Backward-angle meson electroproduction was previously ignored, but is anticipated to ... More
Presented by Prof. Garth HUBER on 12 Apr 2019 at 11:20
Type: plenary talk Session: Plenary
The advent of high intensity hadronic physics experiments has lead to many advances in our understanding of hadronic states, and has raised many questions and new possibilities along the way. One particularly exciting question is how gluonic degrees of freedom contribute to the structure of hadrons. In the meson sector, “hybrid” states with gluonic contributions may have quantum numbers which ... More
Presented by Sean DOBBS on 11 Apr 2019 at 09:00
Type: invited talk Session: EIC
The power-law growth of gluon and sea quark PDFs that has been experimentally observed in the small-x regime is fundamentally inconsistent with basic tenets of quantum field theory. This phenomenon is driven by the explosive rate of soft gluon bremsstrahlung which is a fundamental feature of QCD (or any non-Abelian field theory). In order to be consistent with essential features such as unitarit ... More
Presented by Matthew SIEVERT on 12 Apr 2019 at 11:20
Type: invited talk Session: Quark-Gluon Correlations
We will review recent experimental results on quark-gluon correlations accessible in twist3 observables at RHIC and JLab.
Presented by Dr. Anselm VOSSEN on 11 Apr 2019 at 16:00
Type: plenary talk Session: Plenary
Hot, dense QCD matter has been shown to have some very remarkable properties. Its vanishingly small shear viscosity to entropy density ratio means that it ﬂows essentially without internal friction. It is also very opaque to transiting strongly interacting particles, dispersing the deposited energy rather efficiently. It remains a mystery, though, how this plasma can emerge from the cold, dense ... More
Presented by Barbara JACAK on 12 Apr 2019 at 15:30
Type: invited talk Session: PDFs
Among the basic questions posed by Nature, the following three are basic to hadron physics: How does the ≈ 1 GeV mass-scale that characterizes atomic nuclei appear; Why does it have the observed value; and, enigmatically, why are the composite Nambu-Goldstone bosons in QCD abnormally light in comparison? This presentation will describe analyses of the mass budget of the pion and proton in QCD; ... More
Presented by Dr. Craig ROBERTS on 10 Apr 2019 at 14:25
Type: contributed talk Session: Nucleon Structure
The CJ (CTEQ-Jefferson Lab) Collaboration provides a global fit of parton distribution functions (PDFs) with a special emphasis on the large xbj region. The latest fit (CJ15) implemented deuteron nuclear corrections at the parton level, and included data that were sensitive specifically to the neutron. These nuclear corrections allow for a calculation of the F2 structure functions of the proton, d ... More
Presented by Shujie LI on 12 Apr 2019 at 11:45
Type: contributed talk Session: GPDs
Imaging the 3D partonic structure of the nucleon is a fundamental goal of every major nuclear experimental program, including the EIC. Ji first proposed Deeply Virtual Compton Scattering (DVCS) as a probe for understanding the spatial distribution of the partons by fourier transform of the exchanged momentum transfer between the initial and final proton. The extraction of observables from Deeply ... More
Presented by Brandon KRIESTEN on 11 Apr 2019 at 17:10
Type: invited talk Session: Hadron Form Factors
In 2008 the Jefferson Laboratory F_pi-2 Collaboration released results for the pion electromagnetic form factor, which they had extracted from pion electro-production data. The measured values for the pion form factor were extracted using the Vanderhagen, Guidal and Laget Regge Model. While agreement betweenthis model and data is impressive, the theoretical implementation of gauge invariance is le ... More
Presented by Prof. Anthony THOMAS on 10 Apr 2019 at 16:50
Presented by Prof. Garth HUBER on 11 Apr 2019 at 19:35
Type: contributed talk Session: Production and Decays
Fracture functions describe the production of hadrons in the target remnant region. Similar to both fragmentation and structure functions, these non-perturbative objects are measurable, universal functions that can be extracted from experiment in one kinematic regime and used to compute reactions at different scales, factorizing and evolving in a predictable way. The Jefferson Lab CLAS EG2 data-s ... More
Presented by Sereres JOHNSTON on 11 Apr 2019 at 14:40
Presented by Dr. David RICHARDS on 11 Apr 2019 at 19:15
Type: invited talk Session: GPDs andTMDs
Investigation of GPDs and TMDs represents one of the major goals of the COMPASS-II program. Together, GPDs and TMDs provide the most complete description of the partonic structure of the nucleon. GPDs are experimentally accessible via lepton-induced exclusive reactions, in particular DVCS and DVMP. At COMPASS, these processes are investigated using the 160 GeV polarized muon beams. The DVCS cross ... More
Presented by Nicole D'HOSE on 12 Apr 2019 at 10:55
Type: invited talk Session: EIC
The 2015 U.S. Nuclear Physics Long-Range Plan recommended the realization of an electron-ion collider (EIC) as the next large construction project in the United States. A U.S.-based EIC has also recently been endorsed by the U.S. National Academy of Sciences. With the design of an EIC, advancements in theory and further development of phenomenological tools, we are now preparing for the next st ... More
Presented by Dr. Salvatore FAZIO on 12 Apr 2019 at 10:55
Type: invited talk Session: GPDs andTMDs
In this talk it is discussed how gluon TMDs - in particular the distribution of linearly polarized gluons - can be accessed in proton collisions at the LHC. A particularly promising reaction is the production of quarkonium pairs. Using existing LHCb data for this final state allows to obtain a first idea of how the TMD distribution of unpolarized gluons in the nucleon might look like. In addition ... More
Presented by Marc SCHLEGEL on 12 Apr 2019 at 10:30
Type: plenary talk Session: Plenary
The internal structure of the proton is the result of the strong force, which is by governed Quantum-Chromo-Dynamics (QCD). Experimentally, the internal structure of the proton has been studied extensively through electromagnetic interaction using electron an muon beams. As a result we have precise information about the proton’s charge radius, its electromagnetic elastic and transition form fact ... More
Presented by Dr. Volker BURKERT on 10 Apr 2019 at 10:00
Type: plenary talk Session: Plenary
In this talk, I will review recent progress in lattice-QCD calculations of hadron structure with an emphasis on nucleon structure. A wide range of nucleon observables are being studied in modern lattice calculations, and important progress has been made at physical pion mass, including the spin decomposition of the nucleon and the Bjorken-$x$ dependence of hadron structure. Challenges and pe ... More
Presented by Prof. Huey-Wen LIN on 11 Apr 2019 at 12:00
Type: invited talk Session: Nuclear PDFs
In addition to its role in high-energy astrophysics, the IceCube Neutrino Observatory is a laboratory to study neutrino-nucleon deep inelastic scattering at multi-TeV energies far beyond the reach of accelerators. A recent analysis of contained neutrino interactions in IceCube will be presented where the inelasticity of charged-current $\nu_{\mu}$ interactions (the fraction of neutrino energy tra ... More
Presented by Dr. Gary BINDER on 10 Apr 2019 at 14:25
Type: invited talk Session: EIC
Production of heavy quarkonium provides a unique probe to the gluonic structure of the nucleon. A new generation of experiments at Jefferson Lab in the 12 GeV era will use near-threshold J/ψ production to study topics related to the dynamic origin of nucleon mass, the nature of the color Van der Waals force, and the existence of the LHCb charmed pentaquark. These topics can also be studied at a f ... More
Presented by Dr. Sylvester JOOSTEN on 12 Apr 2019 at 11:45
Type: invited talk Session: Production and Decays
Several new findings in the four, five and six quark systems have catalyzed new interest in the field of multiquark states (beyond the trivial $q\bar q$ and qqq systems). Very significant progress has recently been made in the 6q sector, on both the theoretical and experimental fronts. A resonance like structure observed in double-pionic fusion to the deuteron, at M = 2.38 GeV with $\Gamma$ = 70 M ... More
Presented by Dr. Mikhail BASHKANOV on 10 Apr 2019 at 14:00
Type: invited talk Session: EIC
Melding the physics goals of an EIC with the practicalities of accelerator and magnet design leads to many IR design challenges. Simply bringing beams with quite different properties cleanly into collision with high luminosity and without placing intrusive machine elements inside the detector volume is a first major challenge. In addition, EIC physics requires polarized beams, high field and/or la ... More
Presented by Dr. Brett PARKER on 12 Apr 2019 at 09:20
Type: invited talk Session: Production and Decays
Deep Inelastic Scattering (DIS) experiments on deuterium where the recoiling nucleon is detected as well ("tagged"), allows to measure how the quark-structure of the bound nucleon (as measured by its “structure function”) varies with its initial momentum (as measured by the spectator nucleon momentum). Therefore, we can determine how and why the structure of bound protons differs from fre ... More
Presented by Florian HAUENSTEIN on 10 Apr 2019 at 17:15
Type: invited talk Session: EIC
A U.S.-based Electron-Ion Collider (EIC) has recently been endorsed by the U.S. National Academies of Sciences, Engineering, and Medicine (NAS). This brings the realization of such a collider another step closer, after its earlier recommendation in the 2015 Long-Range Plan for U.S. nuclear science of the Nuclear Science Advisory Committee as the highest priority for new facility construction fo ... More
Presented by Andrei SERYI on 12 Apr 2019 at 08:55
Type: invited talk Session: JPAC
I will discuss the history of JPAC, its mission and contributionx to amplitude analysis and hadron spectroscopy.
Presented by Prof. Adam SZCZEPANIAK on 12 Apr 2019 at 08:30
Type: plenary talk Session: Plenary
Elastic scattering of electrons (or positrons) on the proton (or neutron) provide information on the charge and magnetization distributions inside the nucleon. Traditionally, following the pioneering work of Hofstadter in the mid-fifties, the electric and magnetic form factors GEp and GMp of the proton have been obtained from elastic cross section data from many experiments. In the late 1990’s ... More
Presented by Prof. Charles PERDRISAT on 12 Apr 2019 at 15:00
Type: invited talk Session: Jets
I will discuss recent developments in the theory of jets in ultra-relativistic nuclear collision, with an emphasis on heavy flavor production. Starting with inclusive jets, I will show how the technique of semi-inclusive jet functions, first developed in the framework of soft collinear effective theory, can be applied to c-jets and b-jets in heavy ion collisions. For the case of dijets, I ... More
Presented by Dr. Ivan VITEV on 10 Apr 2019 at 16:25
Type: plenary talk Session: Plenary
With the advent of advanced event generators, and a variety of theoretical advances, jet quenching has now transitioned from a discovery stage to one of systematic exploration. While calculations (or rather simulations) have become considerably extensive, there are practically no jet observables left that cannot be described by what is now referred to as the multi-stage approach. I will describe t ... More
Presented by Abhijit MAJUMDER on 10 Apr 2019 at 09:30
Type: invited talk Session: Jets
The propagation of quarks and gluons through a QCD medium, such as nuclei or the quark-gluon plasma, remains poorly understood. Elucidating this phenomena is a central aspect of the research program of a diverse variety of experiments at JLab12, RHIC, LHC and the future Electron-Ion Collider. At collider energies, this process can be studied with measurements of jet cross-sections and their substr ... More
Presented by Miguel ARRATIA on 10 Apr 2019 at 17:15
Type: invited talk Session: EIC
The Electron Ion Collider (EIC), which will be built in the US during next decade, is proposed as a facility to probe the fundamental structure of matter trough lepton scattering off nucleon and nuclei with unprecedented luminosity. The broad EIC physics program spans from the nucleon tomography to the hadronization in dense nuclear matter. In this talk I'll discuss the opportunity for a light a ... More
Presented by Dr. Marco BATTAGLIERI on 12 Apr 2019 at 09:45
Type: contributed talk Session: Hadron Form Factors
We adopt a chiral nucleon-pion Lagrangian and formulate a Basis Light-Front Quantization approach to solve the resulting light-front Hamiltonian of a nucleon as an eigenvalue problem. We obtain the nucleon mass spectrum and the corresponding light-front wave functions. Based on the light-front wave functions, we calculate the parton distribution functions as well as the elastic electromagnetic for ... More
Presented by Mr. Weijie DU on 10 Apr 2019 at 17:15
Type: invited talk Session: Small Systems
Measurements of two-particle correlations in relative azimuthal angle and pesudorapidity have shown striking similarities between results obtained in pp, and in p+A and A+A collision systems. In pp collisions, unlike in the p+A and A+A systems, the strength of the correlations quantified by the anisotropy parameter $v_2$ does not show any dependence on the charged-particle multiplicity. Recent the ... More
Presented by Dr. Soumya MOHAPATRA on 12 Apr 2019 at 09:45
Type: invited talk Session: Ultra-Peripheral Collisions
Meson production cross sections in ultraperipheral relativistic heavy ion collisions at the CERN Large Hadron Collider are revisited. The relevance of meson models and of exotic QCD states is discussed. This study includes states that have not been considered before in the literature.
Presented by Prof. Carlos BERTULANI on 11 Apr 2019 at 14:00
Type: contributed talk Session: PDFs
We present recent collaborative efforts for solving the bound state Bethe-Salpeter equation in the Minkowski space with the use of the Nakanishi integral representation and also by explicit rotation of the Euclidean energy axis towards the Minkowski axis. We are envisaging future applications to hadrons and in particular to model the pion. In order to do so, we also have to use similar technique ... More
Presented by Prof. Tobias FREDERICO on 10 Apr 2019 at 17:00
Type: contributed talk Session: Production and Decays
Studies of the excited nucleon state ($N^*$) spectrum offer insight into the strong QCD dynamics underlying baryon generation. In particular, they elucidate the symmetries of the strong interaction relevant for the bound systems of three constituent quarks in the regime of large QCD-running coupling. The full spectrum of nucleon resonances shaped the transition from a deconfined mixture of quar ... More
Presented by Dr. Victor MOKEEV on 11 Apr 2019 at 14:00
Type: invited talk Session: JPAC
In this talk I will review the recent analyses and other activities carried out by the JPAC collaboration. In particular, the phenomenological analysis of the $\eta^{(')} \pi$ partial waves measured at COMPASS. We fit the data using a coupled-channel amplitude based on first principles, determining in a robust way the existence of only one hybrid meson candidate $\pi_1$, corresponding to the $\pi ... More Presented by Mr. Arkaitz RODAS on 12 Apr 2019 at 10:30 Type: invited talk Session: Production and Decays Modern experimental facilities and detectors provide tremendous volumes of detailed data. We discuss the analysis of data from piN elastic scattering and single pion photo- and electroproduction. The main focus is a study of low-lying non-strange baryon resonances and physics perspectives for future K-Long facility at JLab. Presented by Prof. Igor STRAKOVSKY on 10 Apr 2019 at 16:25 Type: invited talk Session: Nuclear PDFs One of the most interesting aspects of neutrino-nucleus DIS measurements is the apparent absence of antishadowing of the nuclear parton distributions, in direct contradiction to electron-nucleus and muon-nucleus measurements. This has several implications: (1) anti-shadowing may be flavor specific. This can be tested in semi-inclusive deep inelastic lepton scattering. (2) antishadowing cann ... More Presented by Prof. Stanley BRODSKY on 10 Apr 2019 at 15:15 Type: invited talk Session: GPDs The lepton angular distributions of the Drell-Yan process in fixed-target experiments and the Z-boson production at colliders are investigated by NLO and NNLO perturbative QCD and an intuitive geometric approach. The main features of the kinematic dependencies of the angular distributions coefficients can be well understood in the geometrical approach. Implications of this approach on the ... More Presented by Jen-Chieh PENG on 11 Apr 2019 at 16:25 Type: invited talk Session: Small Systems Hydrodynamics is the accepted framework to describe the evolution of systems created in relativistic heavy-ion collisions. In smaller collision systems, such as proton-lead and proton-proton collisions, other, non-hydrodynamic explanations for the experimentally observed flow signals have been suggested. So which explanation is right or are they both? In this talk I review the applicability ... More Presented by Paul ROMATSCHKE on 12 Apr 2019 at 08:30 Type: plenary talk Session: Plenary This talk will concentrate on recent developments and the resulting current open challenges in neutrino nucleon/nucleus scattering physics across the neutrino energy spectrum. Emphasis will be placed on those aspects where hadronic physics studies can aid in meeting these challenges. Presented by Jorge G MORFIN on 10 Apr 2019 at 11:30 Type: invited talk Session: Onia/HF Heavy flavor quarks offer unique insights to the properties of the strongly coupled Quark-Gluon Plasma (QGP) created in heavy-ion collisions. Recently, precision heavy flavor measurements are made available thanks to the advanced detector technology and high luminosity collisions provided by RHIC and the LHC colliders. In this talk, I will review these recent experimental achievements and discuss ... More Presented by Xin DONG on 12 Apr 2019 at 08:55 Type: invited talk Session: Onia/HF The study of bound heavy quark states has proven to be a crucial tool for investigating the matter formed in collisions of large nuclei. At both RHIC and the LHC, there has been considerable work in understanding the creation of these states in pp collisions, the effects of the nucleus in p+A collisions, and the spectral modifications that arise in A+A collisions. However, despite decades of exp ... More Presented by J. Matthew DURHAM on 12 Apr 2019 at 09:45 Type: invited talk Session: Production and Decays Despite the success of the simple quark model, the spectrum of light mesons is not well understood yet. For the mandatory understanding of the light-meson properties it is necessary to investigate different production processes and decay channels. Two complementary processes, the electron-positron and antiproton-proton annihilation, provide an excellent laboratory for such studies. The presence ... More Presented by Malte ALBRECHT on 10 Apr 2019 at 16:50 Type: contributed talk Session: PDFs We present a statistical description of the hadron structures in terms of the parton gas on the light front. Specifically, the microcanonical molecular dynamics ensemble is generalized to preserve the light front 3-momentum in order to model the phase space distribution of partons confined inside a hardon. With only the light front kinetic energy, the joint longitudinal momentum fraction distribut ... More Presented by Dr. Shaoyang JIA on 10 Apr 2019 at 16:40 Type: contributed talk Session: PDFs We will present our lattice computation of the valence Parton Distribution Function of 300 MeV pion. For this work, we use perturbative matching of the Euclidean RI-MOM renormalized quasi Parton Distribution Function that we compute on HISQ ensembles with 0.06 and 0.04 fm lattice spacings. In addition, we will discuss the validity of leading order perturbative matching and other systematic effec ... More Presented by Dr. Nikhil KARTHIK on 10 Apr 2019 at 14:50 Type: plenary talk Session: Plenary Heavy ion collisions at RHIC and the LHC are perhaps best known for events in which the nuclei collide head-on, creating a volume of hot and dense matter which then decays into very high multiplicity final states. However, large (high Z) nuclei are also intense sources of high energy photons, which can interact with the other nucleus either directly or diffractively, or with each other in a gamma ... More Presented by Peter STEINBERG on 11 Apr 2019 at 11:30 Type: contributed talk Session: Production and Decays The field of multiquark states (beyond the known meson qq and baryon qqq states) has had renewed interest in recent years with findings of potential four, five and six quark states. Recent experiments by the WASA- at-COSY and HADES collaborations have observed a dibaryon (6q) resonant state, the d*(2380). Numerous measurements of this state across a range of different hadronic production channe ... More Presented by Dr. Stephen KAY on 10 Apr 2019 at 14:25 Type: invited talk Session: Hadron Form Factors We present a calculation of the pion form factor using overlap fermions on 2+1-flavor domain-wall configurations on a$24^3\times 64$lattice with$a=0.11 \, {\rm{fm}}$and on a$32^3 \times 64$lattice with$a=0.143 \, {\rm{fm}}$generated by the RBC/UKQCD collaboration. Using the multi-mass algorithm, a simulation has been done with various valence quark masses with a range of space-like$Q^2$f ... More Presented by Gen WANG on 10 Apr 2019 at 16:25 Type: invited talk Session: PDFs An understanding of the partonic structure of hadrons is an essential ingredient in making precise predictions and measurements of hadronic cross-sections and various Standard, and Beyond Standard, Model parameters. Direct first-principles calculations of parton distribution functions (PDFs) via lattice QCD were historically limited to the lowest few moments, principally due to the time-dependence ... More Presented by Mr. Colin EGERER on 10 Apr 2019 at 14:00 Type: invited talk Session: Nucleon Structure Presented by Dr. Simona MALACE on 12 Apr 2019 at 10:55 Type: contributed talk Session: Theoretical Approaches {\it Quantum tomography} is a model-independent approach to characterizing quantum mechanical systems. Recent research in nuclear and particle physics has led to confronting issues of coherence and entanglement, that were sometimes suppressed, or sometimes implemented with models. The classic example is the parton model replacing quantum mechanical formalism by classical probabilistic proxies. Qu ... More Presented by Prof. John RALSTON on 11 Apr 2019 at 14:50 Type: contributed talk Session: Production and Decays If the$X(3872)$is a weakly bound charm-meson molecule, it can be produced by the creation of$D^{*0} \bar{D}^0$or$D^{0} \bar{D}^{*0}$at short distances followed by the formation of the bound state from the charm-meson pairs. It can also be produced by the creation of$D^{*} \bar{D}^*$at short distances followed by the rescattering of the charm mesons into$X \pi$. An effective fiel ... More Presented by Liping HE on 11 Apr 2019 at 14:20 Type: invited talk Session: JPAC I'll review the recent developments in single and double meson photoproduction, including photoproduction of 1 and 2 pseudoscalar(s), and one vector meson. Presented by Dr. Vincent MATHIEU on 12 Apr 2019 at 08:55 Type: invited talk Session: Small Systems In this talk, I review the latest developments in high transverse momentum (pT) or mass probes of small heavy ion collision systems. These include measurements which utilize high-pT hadrons, fully reconstructed jets, photons and heavy electroweak bosons, and heavy flavor particles, as probes. I will discuss what these measurements can reveal about partonic structure and parton dynamics in heavy nu ... More Presented by Prof. Dennis PEREPELITSA on 12 Apr 2019 at 08:55 Type: contributed talk Session: GPDs andTMDs The Mellin moments of Generalized Parton Distributions connect to quantities that describe the QCD energy momentum tensor. They allow us to single out the separate contributions from quarks and gluons. Partonic orbital angular momentum (OAM) plays a key role in our understanding of the long standing proton spin puzzle. Our recent work demonstrates the connection between quark gluon interactions an ... More Presented by Abha RAJAN on 12 Apr 2019 at 11:40 Type: invited talk Session: Onia/HF One of the best ways to understand hadronization in QCD is to study the production of quarkonium. However, the production mechanism of quarkonium is still uncertain. Spin-related measurements like the polarization are strong tests of production models. In this talk I will summarize recent results of quarkonium production and polarization in elementary collisions, including the results from NRQCD a ... More Presented by Mr. Vincent CHEUNG on 12 Apr 2019 at 09:20 Type: contributed talk Session: Production and Decays The A2 Collaboration at the Mainz Microtron MAMI measures photon absorption cross sections using circularly and linearly polarized 'Bremsstrahlung' photons up to an energy of ~1.5GeV. We use a 4 π detection system with the 'Crystal Ball' as central part. We have developed a Frozen Spin Target in close collaboration with the polarized target group of the Joint Institute for Nuclear Research (JI ... More Presented by Dr. Andreas THOMAS on 10 Apr 2019 at 14:45 Type: invited talk Session: Onia/HF We explore the S- and P-states for bottomonia at high temperaures, above the critical temperature$T_c$, using non-relativistic QCD (NRQCD). We extract the spectrum as a function of temperature by looking at point to point correlators and smoothed correlators. We push to the limit of NRQCD for$N_ \tau = 12$which allows us to find the bottomonium spectrum up to a temperature of 334MeV. Presented by Mr. Rasmus LARSEN on 12 Apr 2019 at 08:30 Type: invited talk Session: Jets Heavy ion collisions at high energies are used to study QCD at high temperatures. These high temperatures allow for the formation of a new state of matter called quark-gluon plasma (QGP) where the quarks and gluons inside of the nuclei are no longer confined. Jets are a useful probe of this medium since partons inside the jet are expected to lose energy in interactions with the strongly interactin ... More Presented by Laura HAVENER on 10 Apr 2019 at 16:50 Type: contributed talk Session: Production and Decays The Belle II experiment, currently under construction at the KEK laboratory in Tsukuba, Japan, is the next generation of the highly successful B-factories. A substantial upgrade of both the Belle detector and the KEKB accelerator represent an essentially new experiment. Full physics running will start in early 2019 with a goal of collecting 50 times more data than the first generation B-factories. ... More Presented by Jake BENNETT on 11 Apr 2019 at 15:00 Type: contributed talk Session: Theoretical Approaches The n-particle irreducible effective action is a powerful approach to study non-perturbative systems. The method provides a systematic expansion for which the truncation occurs at the level of the action. At the 2PI level one can renormalize using a complicated procedure which involves introducing multiple sets of counterterms, but the method cannot be extended to higher orders. We have developed ... More Presented by Prof. Margaret CARRINGTON on 11 Apr 2019 at 14:25 Presented by Berndt MUELLER on 11 Apr 2019 at 18:45 Presented by Tim HALLMANN on 11 Apr 2019 at 18:05 Presented by Robert MCKEOWN on 11 Apr 2019 at 19:00 Presented by Dr. Bogdan MIHAILA on 11 Apr 2019 at 18:25 Type: invited talk Session: Hadron Form Factors The GMp Experiment which ran in Experimental Hall A at Jefferson Lab as one of the 12 GeV commissioning experiments measured the elastic cross section from electron-proton scattering with 2-3% accuarcy in the Q^2 range from 7 to 16 (GeV/c)^2. Such measurements test our understanding of nucleon structure in terms of Quantum Chromodynamics (QCD), with high-Q^2 , high-precision data providing strong ... More Presented by Prof. M. Eric Christy CHRISTY on 10 Apr 2019 at 16:00 Type: contributed talk Session: Theoretical Approaches We present a field-strength description for a simple system of SU(2) charges with spherical symmetry and confining boundary conditions. The static Yang-Mills Maxwell equations admit three types of solutions for this system. Type-0 solutions have no topological structure. Type-1 and Type-2 solutions involve a topologically charge domain wall consisting of a surface volume with CP-odd field stren ... More Presented by Dennis SIVERS on 11 Apr 2019 at 14:00 Type: plenary talk Session: Plenary We propose a novel way to search for the dark photon ($A'$), the axion-like pseudo-scalar ($a$), the dark scalar ($\phi$), and the light dark matter ($\chi$) in the Compton process,$\gamma + e^- \rightarrow A'/a/\phi + e^-$with$A'/a/\phi$decaying into leptons, photons, or$\chi$'s (when permitted) for the mass ranges of 1$\leq m_{A'/a/\phi} \leq$100 MeV/$c^2$and 0.5$\leq m_{\chi} \le ... More
Presented by Igal JAEGLE on 11 Apr 2019 at 10:00
Type: invited talk Session: Beam Energy Scans
In this talk, I will give an overview of the recent experimental results from RHIC towards the search for the chiral and vortical effects in p/d+Au, Au+Au and U+U collisions. I will mostly focus on the results from the STAR experiment, RHIC BES program and briefly discuss the plans for the recent Isobar run at RHIC.
Presented by Prithwish TRIBEDY on 11 Apr 2019 at 16:50
Type: contributed talk Session: Nuclear and Heavy Ion
Color transparency (CT) is a fundamental phenomenon of QCD postulating that at high momentum transfer, one can preferentially measure hadrons that fluctuate to a small color neutral transverse size in the nucleus, and final state interactions within the nuclear medium are suppressed. CT is observed experimentally as a rise in the measured nuclear transparency as a function of the momentum transfer ... More
Presented by Holly SZUMILA-VANCE on 10 Apr 2019 at 14:20
Type: invited talk Session: Small Systems
While proton-proton collisions and heavy-ion collisions can be well-described by their own theoretical frameworks – factorization and hydrodynamics, respectively – the collisions of intermediate “small systems” pose unique challenges and opportunities. The “dilute-dilute” limit associated with proton-proton collisions is characterized by the dominance of a single partonic hard scatter ... More
Presented by Dr. Matthew SIEVERT on 12 Apr 2019 at 09:20
Type: plenary talk Session: Plenary
We will discuss the up-to-date theory and review recent experimental results related to understanding the proton radius puzzle, which is the conflict between measurements of the proton radius using muons as compared to measurements using electrons. There are signs that recent electron results are coming closer to the muonic ones, but there is not yet universal agreement, and disagreement leaves o ... More
Presented by Prof. Carl CARLSON on 11 Apr 2019 at 08:30
Type: plenary talk Session: Plenary
In this talk I review the current status of hadron spectroscopy in the hyperon and strange meson sectors. The possibility to improve existing database by orders of magnitude with a secondary beam of $K_L$ at JLab with the GlueX setup in Hall D will be discussed. The proposed measurements will have a broad impact on a different aspects of nuclear and particle physics including: establishment ... More
Presented by Prof. Moskov AMARYAN on 12 Apr 2019 at 13:30
Type: contributed talk Session: Nuclear and Heavy Ion
The color propagation and hadron production from hard interactions in nuclei have been extensively studied over the last few decades. These studies are related to one of the basic phenomenon of quantum chromodynamics (QCD) referred to as hadronization or fragmentation. In this process, an energetic struck quark transforms to color-neutral hadrons making it an effective probe of the confinement dyn ... More
Presented by Dr. Taya CHETRY on 10 Apr 2019 at 14:00
Session: GPDs
Presented by Andrey KIM on 11 Apr 2019 at 17:30
Type: invited talk Session: Production and Decays
The isospin violating decay $\eta\rightarrow\pi^{+}\pi^{-}\pi^{0}$ is the dominant charged decay mode of the $\eta$-meson. This decay is driven by the strong force and allows probing of the light quark masses, because the corresponding decay amplitude is proportional to the quark mass ratio $Q$. The decay amplitude is accessible either via a Dalitz-Plot or partial wave analysis. The latter one all ... More
Presented by Mr. Daniel LERSCH on 11 Apr 2019 at 16:00
Type: invited talk Session: EIC
Transverse momentum dependent (TMD) distributions are a novel QCD tool that allow the mapping of the motion of quarks and gluons in nuclear matter. The Electron-Ion Collider (EIC) will allow for a high-precision study of TMDs at the scale of sea quarks and gluons. In my presentation, I will discuss the requirements on theory as well as on accelerator, detector, and computer technology for the TMD ... More
Presented by Dr. Markus DIEFENTHALER on 12 Apr 2019 at 10:30
Type: invited talk Session: Quark-Gluon Correlations
The Spin Asymmetries of the Nucleon Experiment (SANE) measured two double spin asymmetries using a polarized proton target and polarized electron beam at two beam energies, 4.7 GeV and 5.9 GeV. A large-acceptance open-configuration detector package identified scattered electrons at 40$^{\circ}$ and covered a wide range in Bjorken $x$ ($0.3 < x < 0.8$). Proportional to an average color Lorentz forc ... More
Presented by Whitney ARMSTRONG on 11 Apr 2019 at 17:15
Type: contributed talk Session: Production and Decays
The radiative transitions between quarkonia states via the emission of a photon $\psi_A\to \psi_B\gamma$ have been studied extensively in the literature. In light-front dynamics, transition form factors are usually computed in the Drell-Yan frame, which limits the transfered momentum to the spacelike region. In this work, we explore the radiative transitions between vector and pseudoscalar quarko ... More
Presented by Meijian LI on 11 Apr 2019 at 16:25
Type: contributed talk Session: PDFs
Owing to the growing availability of computational resources as well as steady theoretical advances in lattice gauge theory and perturbative QCD analyses, the dual technologies of Lattice QCD and QCD Global Analyses have proceeded apace in recent years. In this context, it is increasingly suggested that the output of Lattice QCD calculations could serve as important input to Global Analyses of PD ... More
Presented by Dr. Timothy HOBBS on 10 Apr 2019 at 16:00
Type: invited talk Session: Jets
The QCD analog of the Laudau-Pomeranchuk-Migdal (LPM) effect is at the core jet quenching physics. In QCD, the medium-induced gluon radiation spectrum is suppressed in the ultraviolet due to the fact that during the quantum mechanical radiation time, that increases with the gluon frequency, multiple scattering centers act coherently as a single scattering center thus reducing the radiation intensi ... More
Presented by Dr. Yacine MEHTAR-TANI on 10 Apr 2019 at 16:00
Type: invited talk Session: Nucleon Structure
Motivated by the desire to resolve the proton charge radius puzzle which started in 2010, the PRad experiment (E12-11-106) was performed in 2016 in Hall B at Jefferson Lab, with 1.1 GeV and 2.2 GeV unpolarized electron beams to measure the $ep$ elastic scattering cross sections at very low values of four-momentum transfer squared, $Q^2$, ranging from $2\times 10^{-4}$ to $6\times 10^{-2}$ (GeV/c)$... More Presented by Haiyan GAO on 12 Apr 2019 at 10:30 Type: invited talk Session: Beam Energy Scans Experimentally locating the QCD critical point is one of the important scientific goals for the relativistic heavy-ion collision program, with potential connections to a plethora of deep questions on the phase diagram of nuclear matter. I will first argue based on simple parametric reasonings that there shall emerge a set of new dynamical degrees of freedom for the system evolving near the critica ... More Presented by Dr. Yi YIN on 11 Apr 2019 at 16:25 Type: plenary talk Session: Plenary I will give an overview of the important physics questions to be addressed at the future, US-based Electron-Ion Collider (EIC). This includes the mass and spin structure of the nucleon, multi-dimensional tomography and the gluon saturation at small-x. Presented by Dr. Yoshitaka HATTA on 10 Apr 2019 at 11:00 Type: invited talk Session: Nucleon Structure The Tritium program in Hall A at Jefferson Lab utilized the mirror nuclei, Tritium and Helium-3, to study, in a model independent way, the d/u ratio at high-x, the EMC effect in the A=3 nuclei, probe nucleon-nucleon short-range correlations and their isospin dependence, and to investigate the three-body hyper-nuclear bound-system. By the end of November 2018, four highly rated Tritium experiments ... More Presented by Dr. Zhihong YE on 12 Apr 2019 at 11:20 Type: invited talk Session: Production and Decays With new and precise eta photoproduction data, electromagnetic properties of baryonic resonances can be determined with unprecedented accuracy. Recent progress in multi-reaction analyses carried out by the Jülich-Bonn, MAID, Bonn-Gatchina, and other groups are reviewed, with a focus on the resonance spectrum and particular structures at around W=1.68 GeV. Model selection for the determination of ... More Presented by Michael DORING on 10 Apr 2019 at 16:00 Type: invited talk Session: Nuclear PDFs Recent nuclear scattering data from the LHC contain a wealth of information providing important constraints on our knowledge of both nuclear and proton parton distribution functions (PDFs). In this talk, I present the nCTEQ nPDFs (which are now based upon a substantially upgraded code, nCTEQ++) to illustrate this point with a special focus on the ability of$W^\pm/Z$boson production to help dise ... More Presented by Dr. Timothy HOBBS on 10 Apr 2019 at 14:00 Type: plenary talk Session: Plenary Much needed theoretical progress is being made to support the beam energy scan (BES) program at the Relativistic Heavy Ion Collider (RHIC) and to successfully explore nuclear matter at both low and high baryon density, determine if and where there is a QCD critical point, and whether chiral symmetry is restored and the QCD chiral anomaly can be observed in the accessible region of the phase diagra ... More Presented by Dr. Bjoern SCHENKE on 11 Apr 2019 at 11:00 Type: invited talk Session: Beam Energy Scans We will present lattice QCD results on the chiral crossover temperature of QCD for moderately large baryon chemical potential. Firstly, we will present a precise measurement of the QCD pseudo-critical temperature at zero baryon chemical potential, obtained from several chiral susceptibilities. Then we will present results on the QCD pseudo-critical temperature at non-zero baryon chemical potential ... More Presented by Peter PETRECZKY on 11 Apr 2019 at 17:15 Type: plenary talk Session: Plenary The Dyson-Schwinger/Bethe-Salpeter approach provides insight into many connected problems in QCD, proving to be especially powerful in describing processes that are dominated by chiral symmetry and its dynamical breaking. Being formulated in the continuum it avoids some of the difficulties encountered on the Lattice (e.g. chiral quarks etc) at the cost of having to introduce truncations. I will ... More Presented by Dr. Richard WILLIAMS on 10 Apr 2019 at 12:00 Type: invited talk Session: 3D Imaging Presented by Prof. Zein-Eddine MEZIANI on 11 Apr 2019 at 14:25 Type: invited talk Session: JPAC The CLAS experiments have achieved major advances in the study of the$N^*$region of the electroproduction spectrum. Data on electrocouplings of the many baryon resonances in the mass range up to 1.8 GeV showed consistency between the$N\pi$,$N\eta$and$N\pi^+\pi^-\$ channels. We present our theoretical studies of structure functions in view of the CLAS12 experiments planned in the near futur ... More
Presented by Dr. Astrid HILLER BLIN on 12 Apr 2019 at 09:45
Type: invited talk Session: JPAC
Advances in Lattice QCD computations of the excited hadron spectrum require analytic representation of infinite volume three particle scattering amplitudes. We present a representation of the elastic three particle scattering amplitude consistent with the unitarity of the S-matrix. We investigate aspects of its analytic properties, specifically one-particle exchange effects and triangle singularit ... More
Presented by Mr. Andrew JACKURA on 12 Apr 2019 at 09:20
Type: invited talk Session: Quark-Gluon Correlations
While twist-2 GPDs allow determining the distribution of partons on the transverse plane, twist-3 GPDs contain quark-gluon correlations that provide information about the average transverse force acting on quarks in a DIS experiment. We demonstrate how twist-3 GPDs can be used to provide transverse position information about that force.
Presented by Prof. Matthias BURKARDT on 11 Apr 2019 at 16:25
Presented by Dr. Ramona VOGT on 11 Apr 2019 at 19:25
Type: invited talk Session: Quark-Gluon Correlations
In this talk the collinear twist-3 formalism is reviewed, in particular its application to pQCD analyses of transverse spin observables in single-inclusive high-energy processes. The main ingredients in this formalism are three-parton correlation functions that may provide new information on the inner dynamics of quarks and gluons in the nucleon as well as in fragmentation processes. Elements of n ... More
Presented by Marc SCHLEGEL on 11 Apr 2019 at 16:50
Type: invited talk Session: Ultra-Peripheral Collisions
In ultra-peripheral relativistic nuclear collisions, the impact parameter is greater than the sum of the radii of the colliding nuclei. Hadronic interactions are suppressed in these collisions, but the intense flux of photons allows the study of photonuclear and two-photon interactions, providing information about the initial state of the nuclei. The STAR experiment has studied Au+Au collisions a ... More
Presented by Prof. Janet SEGER on 11 Apr 2019 at 14:25
Type: invited talk Session: Ultra-Peripheral Collisions
In this talk, we will review the results by the CMS Collaboration in ultra-peripheral heavy-ion collisions (UPC). In particular, we will present and discuss the results on exclusive Rho0 and Upsilon photo production off the proton, and coherent J/psi photo production off the Pb target. Results on light-by-light scattering and in dijet photoproduction in ultra-peripheral PbPb collisions will also b ... More
Presented by Dr. Daniel TAPIA TAKAKI on 11 Apr 2019 at 14:50
Type: invited talk Session: Ultra-Peripheral Collisions
Ultra-peripheral nucleus-nucleus collisions provide an opportunity to study nuclear parton distributions in a kinematic range not covered by previously existing measurements through measurements of jet photo-production. The ATLAS experiment at the LHC has carried out a set of measurements in 5.02 TeV ultra-peripheral Pb+Pb collisions including a measurement of light-by-light scattering, a prelimin ... More
Presented by Brian COLE on 11 Apr 2019 at 15:15
Presented by Dr. David RICHARDS on 11 Apr 2019 at 18:00
Session: Plenary
Presented by Dr. David RICHARDS on 10 Apr 2019 at 08:45
Type: invited talk Session: 3D Imaging
Presented by Prof. Matthias BURKARDT on 11 Apr 2019 at 14:50
Type: contributed talk Session: Nuclear and Heavy Ion
In hadron physics arrays of silicon drift detectors (SDDs) were extremely successful used for spectroscopy of kaonic atoms. Presently new experiments on X-ray spectroscopy at DAFNE/LNF-INFN in Italy and J-PARC in Japan for the first strong interaction studies of kaonic deuterium are in preparation. The development of SDD X-ray detectors is also crucial for experiments in foundation of quantum phys ... More
Presented by Dr. Johann MARTON on 10 Apr 2019 at 15:20
Type: invited talk Session: EIC
The future electron-ion collider will open exciting new frontiers for research in nuclear physics and QCD. The US nuclear physics community, with world-wide support, has compiled a comprehensive white paper that provides a detailed description of the potential of such a machine and the associated design requirements. Brookhaven National Laboratory is proposing eRHIC, an electron-ion collider b ... More
Presented by Christoph MONTAG on 12 Apr 2019 at 08:30
Type: contributed talk Session: Nuclear and Heavy Ion
The study of anisotropic flow provides strong constraints to the evolution of the medium produced in heavy ion collisions and its event-by-event geometry fluctuations. The strength and predominance of these observables have long been related to collective behavior in the formed medium. Recent results in small systems both at RHIC and LHC provide strong arguments for the formation of such medium at ... More
Presented by Dr. Veronica CANOA ROMAN on 10 Apr 2019 at 15:00
Type: contributed talk Session: Theoretical Approaches
A fundamental question in hadron and nuclear physics is how the mass scale for protons and other hadrons emerges from QCD, even in the limit of zero quark mass. I will discuss a new approach to the origin of the QCD mass scale and color confinement based on "light-front holography", a formalism which relates the bound-state amplitudes in the fifth dimension of AdS space to the boost ... More
Presented by Prof. Stanley BRODSKY on 11 Apr 2019 at 15:15