[Jlab-seminars] Physics Seminar Announcement

[Luci Collins]

*Physics Seminar
Friday, Feb. 18, 2011
11:00AM
Cebaf Center AUD.

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*Kent Paschke
University of Virgina

"HAPPEX-III and Strangeness Contributions
to the Nucleon Vector Form-Factors"*

Precision measurements of parity violation in electron-nucleus elastic 
scattering are sensitive to possible strange quark contributions to the 
electric and magnetic form-factors of the nucleon.  Such measurements 
provide a unique opportunity to illuminate the role of the quark- 
antiquark sea in low-energy Quantum Chromodynamics.  While published 
results have placed a tight upper-bound on strange quark contributions 
to the electric form-factor at low Q2, they have not ruled out possible 
significant contributions to the proton magnetic form-factor.

The HAPPEX-III collaboration has completed a measurement of 
parity-violation in forward angle scattering at Q2 of 0.62 [GeV]2 with 
much greater precision than had previously been achieved in that 
kinematic range.  This measurement is an important complement to the 
existing world data, and in particular will test a region where previous 
results appear to suggest a positive signal.  The result of the 
HAPPEX-III measurement will be revealed, and implications for the 
determination of the strange vector form-factors discussed.


 


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