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Publication Information
Title Precision measurement of the weak charge of the proton and parity violation in the N -> Delta transition
Abstract The Qweak Experiment ran for two and a half years at the Thomas Jefferson National Accelerator Facility in pursuit of Qp w, the neutral weak analog to the electric charge of the proton. Qweak measured the parity-violating asymmetry in elastic electron-proton scattering at an extreme forward angle (Q2 = 0.0249 (GeV/c) 2 ). From the data gathered via the 1.16 GeV 180 µA longitudinally polarized electron beam scattering off the unpolarized photons in the liquid hydrogen target, a value of Qp w (PVES) = 0.0719±0.0045 was determined. The Standard Model has a definite prediction of Qp w (SM) = 0.0708 ± 0.0003, consistent with the value determined by Qweak which sets a limit on possible new physics up to 7.5 TeV. The theory behind the main measurement of the Qweak Experiment is described in this document, along with the apparatus that made the measurement possible. Understanding the kinematics of the apparatus was a vital component to Qweak’s final measurement. An in-depth exp
Author(s) Anna Lee
Publication Date September 2019
Document Type Thesis
Primary Institution Thomas Jefferson National Accelerator Facility, Newport News
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-19-3083 OSTI Number: 1574105
LANL Number: Other Number:
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. Mark L. Pitt Virginia Tech
Attachments/Datasets/DOI Link
Document(s)
Lee_AR_D_20191.pdf (STI Document)
Dataset(s) (none)
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