STI Publications - View Publication Form #13956

Back to Search Results Print
Publication Information
Title Determination of the Proton's Weak Charge via Parity Violating Electron Scattering
Abstract The Qweak experiment, which completed running in May of 2012 at Jefferson Laboratory, has measured the parity-violating asymmetry in elastic electron-proton scattering at four-momentum transfer Q^2=0.025 (GeV/c)^2 in order to provide the first direct measurement of the proton¿s weak charge, Qpw. The Standard Model makes firm predictions for the weak charge; deviations from the predicted value would provide strong evidence of new physics beyond the Standard Model. Using an 89% polarized electron beam at 145 microA scattering from a 34.4 cm long liquid hydrogen target, scattered electrons were detected using an array of eight fused-silica detectors placed symmetric about the beam axis. The parity-violating asymmetry was then measured by reversing the helicity of the incoming electrons and measuring the normalized difference in rate seen in the detectors. The low Q^2 enables a theoretically clean measurement; the higher order hadronic corrections are constrained using previo
Author(s) Joshua Hoskins
Publication Date August 2015
Document Type Thesis
Primary Institution The College of William and Mary, Williamsburg, VA
Affiliation Exp Nuclear Physics / Experimental Halls / Hall C
Funding Source
Proprietary? No
This publication conveys Technical Science Results
Document Numbers
JLAB Number: JLAB-PHY-15-2105 OSTI Number: 1195950
LANL Number: Other Number: DOE/OR/23177-3472
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. David Armstrong W&M
Attachments/Datasets/DOI Link
Document(s)
Dataset(s) (none)
Back to Search Results Print