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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2316
DTSTART:20111110T203000Z
DTEND:20111110T213000Z
DTSTAMP:20240329T083327Z
LAST-MODIFIED:20111102T200528Z
LOCATION:4274 Chamberlin Hall
SUMMARY:The Non-perturbative Gluon Propagator & The Nucleon and Roper
Form Factors in a Contact Interaction.\, NPAC (Nuclear/Particle/Astro/
Cosmo) Forum\, David Wilson\, Argonne National Laboratory
DESCRIPTION: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-per
turbative 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 t
he Landau gauge working in Euclidean space will be presented and compa
red to those obtained via other methods.
\n
\nSecondly\, resul
ts from a recently completed project will also be presented where the
Nucleon\, Roper and transition electromagnetic form factors are obtain
ed in a symmetry preserving treatment of the bound state equations of
QCD. Using a simplified interaction\, the form factors are presented a
s part of a framework capable of simultaneously describing nucleon and
meson physics. The aim of the present study is to address the structu
re of the Roper resonance which has been a puzzle for several decades
and is a key target of the JLab N* program.
URL:https://www.physics.wisc.edu/events/?id=2316
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