Measurement of the Neutral Weak Form Factors of the Proton
Journal Article
·
· Physical Review Letters
OSTI ID:954721
We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from the proton. The kinematic point [(Thetalab) = 12.3r and (Q2) = 0.48 (GeV/c)2] is chosen to provide sensitivity, at a level that is of theoretical interest, to the strange electric form factor GsE. The result, A = - 14.5 + or - 2.2 ppm, is consistent with the electroweak standard model and no additional contributions from strange quarks. In particular, the measurement implies GsE + 0.39GsM = 0.023 + or - 0.034(stat) + or - 0.022(syst) + or - 0.026(delta-GnE), where the last uncertainty arises from the estimated uncertainty in the neutron electric form factor.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 954721
- Report Number(s):
- JLAB-PHY-98-54; nucl-ex/9810012; DOE/ER/40150-3215; PRLTAO; TRN: US201014%%1202
- Journal Information:
- Physical Review Letters, Vol. 82; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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