10-12 April 2019
Denver, CO
US/Mountain timezone
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Contribution contributed talk

Denver, CO - Director's Row J

“Supersymmetric Features of Hadron Physics and other Novel Properties of Quantum Chromodynamics from Light-Front Holography and Superconformal Algebra”

Speakers

  • Prof. Stanley BRODSKY

Primary authors

Content

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-invariant

light-front wavefunctions describing the structure of hadrons in

physical space-time. The result is a set of Poincarè-invariant bound-state

wave equations which incorporate quark confinement and

predict many observed spectroscopic and dynamical features

of hadron physics, such as linear Regge trajectories with identical slope in

both the radial quantum number and the internal orbital angular momentum.

Generalizing this procedure using superconformal algebra

leads to a unified Regge spectroscopy of meson, baryon, and tetraquarks,

including remarkable supersymmetric relations between the masses of

mesons and baryons. The pion bound-state, although composite, is massless for zero

quark mass. One also can predict nonperturbative hadronic observables

such as structure functions, transverse momentum distributions, and the

distribution amplitudes defined from the hadronic light-front wavefunctions.

The analytic behavior of the QCD coupling controlling quark and gluon

interactions at large and small distances is also determined. The result is

an effective coupling defined at all momenta with a transition mass scale

which sets the interface between perturbative and nonperturbative hadron

dynamics. One also obtains a relation between the perturbative QCD

mass scale and hadron masses.