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Title: Measurement of the Proton's Weak Charge at the Qweak Experiment

Abstract

The Qweak experiment at Jefferson Laboratory measures the parity violating asymmetry of polarized electrons scattering from a proton target at very low momentum transfer. In the Standard Model, this asymmetry reveals the proton's coupling to the neutral vector current, the weak charge. This value, measured directly for the first time, will provide a precision test of the Standard Model and will constrain the possibility of relevant physics beyond the Standard Model. The planned precision will probe certain classes of new physics at the ~2 TeV scale. In order to challenge the precise predictions, the asymmetry will be measured with a 2.5 percent accuracy. To achieve such a precision, great care has to be taken on many aspects of the experiment. The very low momentum transfer reduces the hadronic effects to the asymmetry and must be determined to half of a percent accuracy. Beam stability is controlled and monitored constantly and background events are carefully studied.

Authors:
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1068964
Report Number(s):
JLAB-PHY-11-1447; DOE/OR/23177-1892; arXiv:1110.2218
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: Meeting of the Division of Particles and Fields of the American Physical Society (DPF11), August 9-13, 2011, Providence, Rhode Island; Related Information: JLAB-E08-016 (Qweak)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Jean-Francois Rajotte. Measurement of the Proton's Weak Charge at the Qweak Experiment. United States: N. p., 2011. Web.
Jean-Francois Rajotte. Measurement of the Proton's Weak Charge at the Qweak Experiment. United States.
Jean-Francois Rajotte. Sat . "Measurement of the Proton's Weak Charge at the Qweak Experiment". United States. https://www.osti.gov/servlets/purl/1068964.
@article{osti_1068964,
title = {Measurement of the Proton's Weak Charge at the Qweak Experiment},
author = {Jean-Francois Rajotte},
abstractNote = {The Qweak experiment at Jefferson Laboratory measures the parity violating asymmetry of polarized electrons scattering from a proton target at very low momentum transfer. In the Standard Model, this asymmetry reveals the proton's coupling to the neutral vector current, the weak charge. This value, measured directly for the first time, will provide a precision test of the Standard Model and will constrain the possibility of relevant physics beyond the Standard Model. The planned precision will probe certain classes of new physics at the ~2 TeV scale. In order to challenge the precise predictions, the asymmetry will be measured with a 2.5 percent accuracy. To achieve such a precision, great care has to be taken on many aspects of the experiment. The very low momentum transfer reduces the hadronic effects to the asymmetry and must be determined to half of a percent accuracy. Beam stability is controlled and monitored constantly and background events are carefully studied.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {10}
}

Conference:
Other availability
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