Final Results from the Jefferson Lab Qweak Experiment and Constraints on Physics Beyond the Standard Model
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Qweak Collaboration. et al.
The Qweak ep elastic scattering experiment used to extract an asymmetry at Q2 = 0.0248 GeV2 will be described. The final result was -226.5 ± 9.3 ppb- the most precise ep asymmetry ever measured. Some of the backgrounds and corrections applied in the experiment will be explained and quantified, and some of the experimental challenges will be described. Several methods used to extract consistent values of the proton’s weak charge Qw(p) from our asymmetry measurement will be outlined. We also show the multi-TeV mass reach for beyond-the-Standard-Model physics obtained from our determination of the proton’s weak charge, and discuss our sensitivity to specific examples of new physics like compositeness. From the proton’s weak charge, a result for the fundamental standard model parameter sin2θW is obtained at the energy scale of our experiment. We compare that to the few other determinations of sin2θW available in the literature, as well as the predicted behaviour based on SM input.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); Natural Sciences and Engineering Research Council of Canada (NSERC); Canadian Foundation for Innovation (CFI); National Science Foundation (NSF)
- Contributing Organization:
- Qweak Collaboration
- Grant/Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1908931
- Report Number(s):
- JLAB-PHY-19-2737; DOE/OR/23177-4614; TRN: US2312073
- Journal Information:
- PoS - Proceedings of Science, Vol. 346; Conference: 23. International Spin Physics Symposium (SPIN2018), Ferrara (Italy), 10-14 Sep 2018; ISSN 1824-8039
- Publisher:
- SISSACopyright Statement
- Country of Publication:
- United States
- Language:
- English
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