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Measurement of the neutral weak form-factors of the proton
- Source :
- Physical Review Letters, Physical Review Letters, 1999, 82, pp.1096-1100, Physical Review Letters, American Physical Society, 1999, 82, pp.1096-1100
- Publication Year :
- 1999
- Publisher :
- HAL CCSD, 1999.
-
Abstract
- We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from the proton. The kinematic point (theta_lab = 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 electric form factor G_E^s. 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 G_E^s + 0.39G_M^s = 0.023 +- 0.034 (stat) +- 0.022 (syst) +- 0.026 (delta G_E^n), where the last uncertainty arises from the estimated uncertainty in the neutron electric form factor.
Details
- Language :
- English
- ISSN :
- 00319007 and 10797114
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters, Physical Review Letters, 1999, 82, pp.1096-1100, Physical Review Letters, American Physical Society, 1999, 82, pp.1096-1100
- Accession number :
- edsair.dedup.wf.001..cb688f86390055c656d1d583c973a7da