<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body alink="#ee0000" bgcolor="#ffffff" link="#0000ee" text="#000000"
vlink="#551a8b">
<font color="#000099"><b><font color="#3333ff">Physics Seminar<br>
</font></b></font><font color="#3333ff"><b>April 13, 2012<br>
11:00 AM<br>
CEBAF Center AUD.<br>
Cookies and Coffee 10:45AM<br>
</b></font><br>
<b><font color="#990000">Xiaochao Zheng
<br>
University of Virginia
<br>
<br>
"Measurement of the Parity Violation Asymmetry in Deep Inelastic
Scattering"</font>
</b><br>
<br>
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 GeV<sup
class="moz-txt-sup">2</sup>, 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 GeV<sup
class="moz-txt-sup">2</sup> 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.
<br>
<br>
<font color="#990000"><b><font color="#cc0000"></font></b></font><br>
<font color="#cc0000"><br>
</font> <br>
<br>
<b><font color="#000099"><font color="#3333ff"> </font></font></b>
<br>
<br>
<br>
<br>
<br>
<br>
<b><font color="#cc0000"><br>
</font><font color="#cc0000"><tt> </tt></font></b><br>
<font color="#000099"><b><font color="#3333ff"><br>
</font></b></font><br>
<br>
<br>
<font color="#000099"><br>
<b><br>
</b></font><br>
</body>
</html>