Towards a Precision Measurement of Parity-Violating e-p Elastic Scattering at Low Momentum Transfer

Thesis/Dissertation · Sun Jan 01 00:00:00 EST 2012

DOI:https://doi.org/10.2172/1043435· OSTI ID:1043435

Pan, Jie ^[1]

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1. Univ. of Manitoba, Winnipeg (Canada)

The goal of the Q-weak experiment is to make a measurement of the proton's weak charge Q_W^p = 1 - 4 sin²(θ_{W2(θW2(θWW^p by measuring the parity violating asymmetry in elastic electron-proton scattering at low momentum transfer Q² = 0.026 (GeV/c)² and forward angles (8 degrees). The anticipated size of the asymmetry, based on the SM, is about 230 parts per billion (ppb). With the proposed accuracy, the experiment may probe new physics beyond Standard Model at the TeV scale. This thesis focuses on my contributions to the experiment, including track reconstruction for momentum transfer determination of the scattering process, and the focal plane scanner, a detector I designed and built to measure the flux profile of scattered electrons on the focal plane of the Q-weak spectrometer to assist in the extrapolation of low beam current tracking results to high beam current. Preliminary results from the commissioning and the first run period of the Q-weak experiment are reported and discussed.}

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1043435
• Report Number(s): JLAB-PHY-12-1579; DOE/OR/23177-2195; TRN: US1203278
• Resource Relation: Related Information: JLAB-EXP-08-016
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCURACY
ASYMMETRY
BEAM CURRENTS
CEBAF ACCELERATOR
COMMISSIONING
ELASTIC SCATTERING
ELECTRONS
EXTRAPOLATION
FORECASTING
MOMENTUM TRANSFER
PARITY
PHYSICS
PROBES
SCATTERING
SPECTROMETERS
STANDARD MODEL