[Theory-seminars] Reminder: Lecture Series and Cake Seminar TODAY

[Christopher Thomas]

Dear all,

Just a reminder that there's the start of a mini lecture series THIS
MORNING (Wednesday, March 24) at *11AM in F113*.  We also have a cake
seminar this afternoon at 3pm in L104.  Details follow below.


-----
*Mini lecture series* on "The transverse spin and momentum structure of
hadrons"

Wednesday 24th, Friday 26th and Monday 29th March
11am
Room F113

Leonard Gamberg
Penn State

Theoretical  and experimental research on hard scattering processes has
resulted in a great deal of knowledge on the partonic content of hadron
structure. These talks focus on the role that transverse spin and
momentum correlations play in our understanding of the partonic
sub-structure of the  hadrons in the context of QCD scattering
reactions such as semi-inclusive deep inelastic scattering.  An emphasis
is placed on the emerging role of so call naive time reversal odd
("T-odd") effects in describing these correlations in terms of parton
distribution and fragmentation functions.  I will  summarize the key
theoretical issues and discuss some experimental results that have led
us to the present understanding.


-----
Wednesday, March 24th
3pm
Room L104

*A Dyson-Schwinger equation study of the nucleon-photon vertex*

Diana Nicmorus
Univ. Graz, Austria

I present a Dyson-Schwinger equation motivated study of the physics
that governs the nucleon. In particular I focus on the quark-core
contributions to the nucleon mass and form factors. The calculations
are performed within in a Poincare-covariant Faddeev framework
describing the quark-core of the nucleon via a quark-diquark picture.
A consistent setup for the dressed-quark propagator, the quark-quark
and the quark-diquark interactions is used, where all the ingredients
are solutions of their respective Dyson-Schwinger or Bethe-Salpeter
equations and obtained in the rainbow-ladder truncation. In the
quark-diquark picture a nucleon-photon vertex that fulfills the
electromagnetic Ward-Takahashi identity is resolved by specifying
the quark-photon and diquark-photon vertices, and by using a
consistent ansatz for the seagull terms. I discuss the evolution of
the nucleon properties with the current quark mass, as well as the
role of the pion cloud in this approach. I also present a comparison
of the results to a collection of experimental and lattice data.

Cake Sponsor: Rocco


-----


A complete list of upcoming theory seminars and talks from previous
seminars are available from:
http://www.jlab.org/~thomasc/seminars/index.html

Thanks,
Christopher


-- 
Christopher Thomas

Jefferson Laboratory
12000 Jefferson Avenue
Suite #1
Newport News
VA 23606
USA

Tel: +1 (757) 269 7453
Email: thomasc at jlab.org