8th Workshop of the APS Topical Group on Hadronic Physics

10-12 April 2019
Denver, CO
US/Mountain timezone
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Production and Decays

Place

Location: Denver, CO
Address: Sheraton Denver Downtown Hotel, 1550 Court Pl. lobby level of the Plaza building
Date: from 10 Apr 14:00 to 11 Apr 17:25

Conveners

• 10 Apr 14:00 - 15:40 I
• Dr. Doring, Michael (George Washington U and Jefferson Lab)
• 10 Apr 16:00 - 17:40 II
• Dr. Mokeev, Victor I Mokeev (Thomas Jefferson National Accelerator Facility)
• 11 Apr 14:00 - 15:20 III
• Prof. Strakovsky, Igor (The George Washington University)
• 11 Apr 16:00 - 17:25 IV
• Dr. Messchendorp, Johan (University of Groningen)

Timetable | Contribution List

Displaying 17 contributions out of 17
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 11/4/2019 at 23:05
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 11/4/2019 at 16:45
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 10/4/2019 at 21:25
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 10/4/2019 at 15:05
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 11/4/2019 at 14:40
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 10/4/2019 at 20:00
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 10/4/2019 at 23:15
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 11/4/2019 at 14:00
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 10/4/2019 at 22:25
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 10/4/2019 at 22:50
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 10/4/2019 at 14:25
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 11/4/2019 at 14:20
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 10/4/2019 at 14:45
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 11/4/2019 at 21:00
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 11/4/2019 at 22:00
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 11/4/2019 at 16:25
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 10/4/2019 at 22:00
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