[Jlab-seminars] Physics Seminar Announcement

[Luci Collins]

*Physics Seminar
**April 13, 2012
11:00 AM
CEBAF Center AUD.
Cookies and Coffee 10:45AM
*
*Xiaochao Zheng
University of Virginia

"Measurement of the Parity Violation Asymmetry in Deep Inelastic 
Scattering" *

The parity violation asymmetry in electron deep inelastic scattering off 
an isoscalar target such as the deuteron is sensitive to the electroweak 
neutral couplings of electrons and quarks, as well as the deuteron 
structure.  During the Jefferson Lab 6 GeV PVDIS experiment in 2009, 
this asymmetry was measured at two Q2 values of 1.1 and 1.9 GeV2, to 
statistical precisions of 3% and 4%, respectively. Assuming the higher 
twist effect to be small compared to the uncertainty of the measurement, 
the asymmetry at 1.9 GeV2 was used to extract the EW coupling 
combination 2C_{2u} - C_{2d}.  The asymmetries at both Q2 values were 
used to perform a simutaneous fit to the C_{2q} and the higher twist 
coefficient \beta_{HT}.  In this talk I will review the experiment, all 
systematic uncertainty contributions, and present the final results.

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