The Qweak^p experiment at Jefferson Laboratory
A major new experiment is being prepared at Jefferson Laboratory to measure the proton's weak charge via the parity violating asymmetry in elastic electron-proton scattering at very low momentum transfer. The Standard Model makes a firm prediction of the protonâ s weak charge, Q_w^p = 1 - 4 sin2thetaW, based on the running of the weak mixing angle sin2thetaW from the Z^0 pole down to low energies, corresponding to a 10sigma effect in our experiment. Our ultimate goal is to determine the protonâ s weak charge with 4% combined statistical and systematic errors, which in turn leads to a 0.3% measurement of sin2 thetaW. The experiment is currently under construction; installation in Hall C at Jefferson Lab followed by data taking is planned for 2009.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-060R23177
- OSTI ID:
- 956166
- Report Number(s):
- JLAB-PHY-06-676; DOE/OR/23177-0612; TRN: US1004906
- Resource Relation:
- Conference: Invited Talk compiled for PAVI06
- Country of Publication:
- United States
- Language:
- English
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