[Jlab-seminars] Physics Seminar Announcement Reminder

[Luci Collins]

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**Physics Seminar
**April 13, 2012
11:00 AM
CEBAF Center AUD.
Cookies and Coffee 10:45AM
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*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 JLab 6 GeV PVDIS experiment in 2009, this 
asymmetry was measured at two Q2 values of 1.1 and 1.9 GeV$^2$, 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 is 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 and describe all systematic 
uncertainties. I will present the final results on the asymmetries. 
Because the radiative corrections are not completely done, I will 
present only the preliminary uncertainty on $2C_{2u}-C_{2d}$ and 
$\beta_{HT}$.





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