APS » PROLA » Phys. Rev. Lett. » Volume 82 » Issue 6

Phys. Rev. Lett. 82, 1096 - 1100 (1999)

Measurement of the neutral weak form factors of the proton
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K. A. Aniol et al. (HAPPEX Collaboration)
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Received 16 October 1998

We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from the proton. The kinematic point [ 〈θlab〉  =  12.3° 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 GEs. The result, A  =  -14.5±2.2 ppm, is consistent with the electroweak standard model and no additional contributions from strange quarks. In particular, the measurement implies GEs+0.39GMs  =  0.023±0.034(stat)±0.022(syst)±0.026(δGEn), where the last uncertainty arises from the estimated uncertainty in the neutron electric form factor.


©1999 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v82/p1096
DOI: 10.1103/PhysRevLett.82.1096
PACS: 13.40.Gp, 11.30.Er, 13.60.Fz, 14.20.Dh

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