The Q{sub Weak}{sup p} Experiment A Search For Physics Beyond The Standard Model Via A Measurement Of The Proton's Weak Charge

Journal Article · Wed Aug 04 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3480194· OSTI ID:21410818

Gericke, Michael T ^[1]

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1. University of Manitoba, Winnipeg R3T2N2, MB (Canada)

The Qweak collaboration is currently preparing a measurement of the proton's weak charge Q{sub W}{sup p} = (1-4 sin{sup 2{theta}}{sub W}) at the Thomas Jefferson National Accelerator Facility (TJNAF). The experiment has been designed to produce a 4.1% measurement of the weak charge, via a 2.5% measurement of the parity violating asymmetry in the number of elastically scattered 1 GeV electrons from protons, at forward angles. At the proposed precision, the experiment would produce a 0.3% measurement of the weak mixing angle at a momentum transfer of {approx_equal} 16 GeV, making it the most precise stand alone measurement of the weak mixing angle at low momentum transfer. In combination with other parity measurements, Qweak will also provide a high precision determination of the weak charges of the up and down quarks. Our proposed measurement of Q{sub W}{sup p} will be performed with significantly smaller statistical and systematic errors than existing low Q{sup 2} data. Any significant deviation from the Standard Model prediction at low momentum transfer (Q{sup 2}) would be a signal of new physics, whereas agreement would place new and significant constraints on possible Standard Model extensions. The experiment is currently being installed. Commissioning of the experiment will begin in May 2010 and the first production data will be taken in the Fall of 2010.

• OSTI ID: 21410818
• Journal Information: AIP Conference Proceedings, Vol. 1265, Issue 1; Conference: 8. Latin American symposium on nuclear physics and applications, Santiago (Chile), 15-19 Dec 2009; Other Information: DOI: 10.1063/1.3480194; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

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