Measurement of the neutral weak form factors of the proton

Citation
Ka. Aniol et al., Measurement of the neutral weak form factors of the proton, PHYS REV L, 82(6), 1999, pp. 1096-1100
Citations number
18
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
82
Issue
6
Year of publication
1999
Pages
1096 - 1100
Database
ISI
SICI code
0031-9007(19990208)82:6<1096:MOTNWF>2.0.ZU;2-Z
Abstract
We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from the proton. The kinematic point [[th eta(1ab)] = 12.3 degrees and [Q(2)] = 0.48 (GeV/c)(2)] is chosen to provide sensitivity, at a level that is of theoretical interest, to the strange el ectric form factor G(E)(s). The result, A = -14.5 +/- 2.2 ppm, is consisten t with the electroweak standard model and no additional contributions from strange quarks. In particular, the measurement implies G(E)(s) + 0.39G(M)(s ) = 0.023 +/- 0.034(stat) +/- 0.022(syst) +/- 0.026(delta G(E)(n)), where t he last uncertainty arises from the estimated uncertainty in the neutron el ectric form factor. [S0031-9007(98)08312-4].