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This Week at Physics

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Event Number 2316

  Thursday, November 10th, 2011

NPAC (Nuclear/Particle/Astro/Cosmo) Forum
The Non-perturbative Gluon Propagator & The Nucleon and Roper Form Factors in a Contact Interaction.
Time: 2:30 pm
Place: 4274 Chamberlin Hall
Speaker: David Wilson, Argonne National Laboratory
Abstract: The Non-Perturbative Gluon Propagator is a principal tool in investigating strongly coupled QCD. It may be obtained from Lattice QCD or its Schwinger-Dyson equation, which shall be discussed here. The transition from perturbative behaviour at large momenta to non-perturbative behaviour at small momenta is accompanied by characteristic phenomena such as dynamical chiral symmetry breaking and confinement. The gluon is expected to play a key role in this through the behaviour of the propagator dressing and its coupling to quarks. Solutions in the Landau gauge working in Euclidean space will be presented and compared to those obtained via other methods.

Secondly, results from a recently completed project will also be presented where the Nucleon, Roper and transition electromagnetic form factors are obtained in a symmetry preserving treatment of the bound state equations of QCD. Using a simplified interaction, the form factors are presented as part of a framework capable of simultaneously describing nucleon and meson physics. The aim of the present study is to address the structure of the Roper resonance which has been a puzzle for several decades and is a key target of the JLab N* program.
Host: Michael J. Ramsey-Musolf & Mario Pitschmann
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