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Theory Center Seminar<br>
Wednesday, March 2, 2016<br>
3:00 p.m. (coffee at 2:45 p.m.)<br>
CEBAF Center, Room F326<br>
<br>
Gernot Eichmann<br>
<div class="moz-forward-container"> Giessen University<br>
<br>
<b>From Quarks and Gluons to the Structure of Hadrons </b><br>
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<br>
Quarks and gluons are the fundamental building blocks of visible
matter, yet we cannot observe them because <br>
they are confined inside hadrons. In light of ongoing experimental
advances at Jefferson Lab and other facilities,<br>
the theoretical description of hadrons within QCD still poses an
enormous challenge: What is the nature of baryon<br>
resonances? Do tetraquarks and pentaquarks exist and if so, how
should we interpret them? Can we describe <br>
nucleon form factors, polarizabilities, or electroproduction
amplitudes from the level of quarks and gluons? Is it <br>
possible to understand nuclei from the fundamental interactions in
QCD? <br>
<br>
Here I will discuss the approach employing Dyson-Schwinger,
Bethe-Salpeter and Faddeev equations, whose basic <br>
promise is to calculate hadron properties from the nonperturbative
structure of the underlying Green functions in <br>
QCD – the quark and gluon propagators, quark-gluon vertex, etc. I
will highlight some recent progress that has been <br>
made regarding the spectrum of mesons and baryons, tetraquarks,
nucleon and nucleon resonance form factors, <br>
Compton scattering, and the muon g-2 problem, and I will discuss
future perspectives and opportunities within <br>
this framework. <br>
<br>
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