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Physics Seminar <br>
Fri., Nov.13, 2009, 11:00 AM<br>
CEBAF Center Aud.<br>
Cookies & Coffee at 10:45 AM<br>
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Fatiha Benmokhtar
<br>
Carnegie Mellon University
<br>
<br>
"Flavor Decomposition of the Nucleon Electromagnetic Form Factors"
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In order to do the complete separation of the three lightest quarks
contributions to the electromagnetic properties of the nucleon, several
Parity Violation(PV) electron scattering experiments have been carried
out during the last decade. The G0 experiment at the Thomas Jefferson
National Accelerator Facility measured the PV asymmetry in the cross
section for polarized electrons off liquid hydrogen and deuterium.
Measurements were made at two momentum transfers 0.23 and 0.62 (GeV/c)<sup
class="moz-txt-sup">2</sup>. Combined with forward angle measurements
by the same collaboration on a hydrogen target, the contribution of
strange quarks to the proton's charge and magnetization distributions
are determined. Details of the experimental setup including the data
acquisition and electronics readout will be shown. Final results of
the complete separation of the strange electric and strange magnetic
form factors will be presented and compared to a variety of theoretical
predictions. Complete decomposition of the nucleon electromagnetic
form factors to the lightest three flavors is obtained.
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Upcoming Seminars:
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Nov. 20 - Jacques Soffer (Temple University)
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Nov. 25 - Yi Qiang (Duke)
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Dec. 4 - Seamus Riordan (UVa)
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Dec. 15 - Heidi Schellman (Northwestern)<br>
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