STI Publications - View Publication Form #14058
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Publication Information
| Title | The Weak Charge of the Proton: A Search For Physics Beyond the Standard Model | ||||
| 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 previous parity-viol | ||||
| Author(s) | Scott MacEwan | ||||
| Publication Date | March 2015 | ||||
| Document Type | Thesis | ||||
| Primary Institution | University of Manitoba, Winnipeg, Canada | ||||
| Affiliation | Exp Nuclear Physics / Experimental Halls / Hall C | ||||
| Funding Source | |||||
| Proprietary? | No | ||||
| This publication conveys | Technical Science Results | ||||
| Document Numbers |
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| Associated with an experiment | Yes | ||||
| Experiment Number(s) |
E08-016
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| Associated with EIC | No | ||||
| Supported by Jefferson Lab LDRD Funding | No |
Thesis
| Thesis Type | PhD |
| Advisor | Institution |
| 1. Michael Gericke | U. of Manitoba |
Attachments/Datasets/DOI Link
| Document(s) |
macewan_scott.pdf
(STI Document)
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| Dataset(s) | (none) |
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