[Cuga] Pizza Seminar Series - Wednesday, April 18, 2012 - A message from Hari Areti

[Jodi Patient]

Please RSVP to: patient at jlab.org <mailto:patient at jlab.org> by COB on 
April 16, 2012.

                              Wednesday, April 18, 2012
****CC F113****
                                    12:00 - 1:00 p.m.



*                    The g2p experiment*


  *                                        Karl Slifer*

                           University of New Hampshire

Abstract:
JLab is the world's premiere facility to study nucleon structure. As the
result of a dedicated experimental program, the inclusive nucleon structure
functions have been well determined, with the exception being gp
2 which is relatively unknown. The g2p experiment aims to address this 
with a mea-
surement of polarized inclusive electron scattering at low momentum 
transfer.
This data is needed to clarify the failure of chiral perturbation theory 
to re-
produce the nucleon spin polarizabilities. But a precise determination of gp
2 is also critical for a full understanding of the simplest bound atomic 
systems.
Proton structure contributes a significant correction to atomic energy 
levels.
These corrections are dominated by the contribution from very low Q2, and
affect a range of Q.E.D. calculations; from hyperfine splitting to 
extractions
of the proton charge radius.
After a string of mechanical and design setbacks, the g2p experiment has
completed its first production measurement at Q2 = 0.06 GeV2. We will dis-
cuss the physics motivation, technical challenges, and show some preliminary
results.

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