The Qweak experiment: a precision measurement of the proton's weak charge
The Qweak experiment [1] will conduct the first precision measurement of the weak charge of the proton, QWp, at Jefferson Laboratory, building on the technical advances that have been made in the laboratory's parity-violation program and using the results of earlier measurements to constrain hadronic corrections. When the results from this measurement are combined with atomic-parity violation and other PVES measurements the weak charges of the `up' and `down' quarks can be extracted. The experiment is basically a measurement of the parity-violating longitudinal analyzing power in e-p elastic scattering at Q2 = 0.026 (GeV/c)2 employing 150 µA's of 85% polarized electrons on a 0.35 m long liquid hydrogen target. The experiment will determine the weak charge of the proton with about 4.1% combined statistical and systematic errors. This corresponds to constraints on parity violating new physics at a mass scale of 2.3 TeV at the 95% confidence level.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 984838
- Report Number(s):
- JLAB-PHY-09-1032; DOE/OR/23177-1263; TRN: US1006050
- Journal Information:
- AIP Conference Proceedings: Achievements And New Directions In Subatomic Physics: Workshop In Honour Of Tony Thomas' 60th Birthday, Vol. 1261; Conference: Achievements And New Directions In Subatomic Physics: Workshop In Honour Of Tony Thomas' 60th Birthday, 15-19 Feb 2010, Adelaide, Australia
- Country of Publication:
- United States
- Language:
- English
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