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Title Measuring the Weak Charge of the Proton via Elastic Electron-Proton Scattering
Abstract The Qweak experiment which ran in Hall C at Jefferson Lab in Newport News, VA, and completed data taking in May 2012, measured the weak charge of the proton QpW via elastic electron-proton scattering. Longitudinally polarized electrons were scattered from an unpolarized liquid hydrogen target. The helicity of the electron beam was ipped at approximately 1 kHz between left and right spin states. The Standard Model predicts a small parity-violating asymmetry of scattering rates between right and left helicity states due to the weak interaction. An initial result using 4% of the data was published in October 2013 [1] with a measured parity-violating asymmetry of -279 +/- 35(stat) +/- 31 (syst) ppb. This asymmetry, along with other data from parity-violating electron scattering experiments, provided the world's first determination of the weak charge of the proton. The weak charge of the proton was found to be QpW = 0:064 =/- 0:012, in good agreement with the Standard Model prediction of
Author(s) Donald Jones
Publication Date October 2015
Document Type Thesis
Primary Institution University of Virginia, Charlottesville, VA
Affiliation Exp Nuclear Physics / Experimental Halls / Hall C
Funding Source Nuclear Physics (NP)
Proprietary? No
This publication conveys Technical Science Results
Document Numbers
JLAB Number: JLAB-PHY-15-2175 OSTI Number: 1227207
LANL Number: arXiv:1601.07172 Other Number: DOE/OR/23177-3612
Associated with an experiment Yes
Experiment Number(s)
E08-016
Associated with EIC No
Supported by Jefferson Lab LDRD Funding No
Thesis
Thesis Type PhD
Advisor Institution
1. Kent Paschke University of Virginia
Attachments/Datasets/DOI Link
Document(s)
DonJonesThesisFinal-1.pdf (STI Document)
Dataset(s) (none)
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