[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Wednesday, March 2, 2016
3:00 p.m. (coffee at 2:45 p.m.)
CEBAF Center, Room F326

Gernot Eichmann
Giessen University

*From Quarks and Gluons to the Structure of Hadrons *

Quarks and gluons are the fundamental building blocks of visible matter, 
yet we cannot observe them because
they are confined inside hadrons. In light of ongoing experimental 
advances at Jefferson Lab and other facilities,
the theoretical description of hadrons within QCD still poses an 
enormous challenge: What is the nature of baryon
resonances? Do tetraquarks and pentaquarks exist and if so, how should 
we interpret them? Can we describe
nucleon form factors, polarizabilities, or electroproduction amplitudes 
from the level of quarks and gluons? Is it
possible to understand nuclei from the fundamental interactions in QCD?

Here I will discuss the approach employing Dyson-Schwinger, 
Bethe-Salpeter and Faddeev equations, whose basic
promise is to calculate hadron properties from the nonperturbative 
structure of the underlying Green functions in
QCD -- the quark and gluon propagators, quark-gluon vertex, etc. I will 
highlight some recent progress that has been
made regarding the spectrum of mesons and baryons, tetraquarks, nucleon 
and nucleon resonance form factors,
Compton scattering, and the muon g-2 problem, and I will discuss future 
perspectives and opportunities within
this framework.

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