[Jlab-seminars] Today's Physics Seminar: Joshua Magee; “Qweak : Parity Violating Electron Scattering on Hydrogen and Aluminum"

[Stephanie Tysor]

*Physics Seminar*

*Joshua Magee*

The College of William and Mary

**

/“//Qweak : Parity Violating Electron Scattering on Hydrogen and 
Aluminum//"/////

Abstract//


The Qweak experiment completed data taking at Jefferson Laboratory in 
2012, with the aim of making the _rst experimental determination of the 
proton's weak charge, QpW, which is the neutral-weak analog of the 
proton's electric charge. The experiment measured the small 
parity-violating asymmetry in elastic electron-proton scattering at 
forward angles and low momentum-transfer (Q2 = 0:026 GeV2), allowing 
direct extraction of QpW. One key piece of the experiment is accounting 
for the target thin aluminum windows, which provided about

30% of the measured signal. This correction required careful 
measurements of both scattering rate and the _rst measurement of the 
parity-violating asymmetry on aluminum. An experimental overview will be 
provided, along with preliminary analysis and future implications to 
Standard Model physics. Emphasis will be placed on the aluminum target 
background correction, including the parity-violating asymmetry 
measurement in aluminum.

*Monday, July 6, 2015*

*11:00 am*

*CEBAF Center Conference Room L102*

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