Q weak: First direct measurement of the proton’s weak charge
The Qweak experiment, which took data at Jefferson Lab in the period 2010 - 2012, will precisely determine the weak charge of the proton by measuring the parity-violating asymmetry in elastic e-p scattering at 1.1 GeV using a longitudinally polarized electron beam and a liquid hydrogen target at a low momentum transfer of Q2 = 0.025 (GeV/c)2. The weak charge of the proton is predicted by the Standard Model and any significant deviation would indicate physics beyond the Standard Model. The technical challenges and experimental apparatus for measuring the weak charge of the proton will be discussed, as well as the method of extracting the weak charge of the proton. Finally, the results from a small subset of the data, that has been published, will also be presented. Furthermore an update will be given of the current status of the data analysis.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Organization:
- Jefferson Lab Qweak Collaboration
- Grant/Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1350092
- Report Number(s):
- JLAB-PHY-16-2377; DOE/OR/23177-4110; PII: epjconf_conf2017_08005; TRN: US1700590
- Journal Information:
- EPJ Web of Conferences, Vol. 137; Conference: Confinement XII, Thessaloniki (Greece), 28 Aug - 4 Sep 2016; ISSN 2100-014X
- Publisher:
- EDP SciencesCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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