Measurement of the neutral weak form-factors of the proton - INSPIRE

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Measurement of the neutral weak form-factors of the proton

HAPPEX

Collaboration

•

K.A. Aniol
(
- Cal State, L.A.
)

Oct, 1998

10 pages

Published in:

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

e-Print:

nucl-ex/9810012 [nucl-ex]

DOI:

10.1103/PhysRevLett.82.1096

Report number:

WM-98-117,
JLAB-PHY-98-54

Experiments:

JLAB-E-99-115

View in:

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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.

electron p: elastic scattering
electron p: polarized beam
p: form factor
form factor: strangeness
form factor: weak interaction
parity: violation
nucleon: strangeness
interference: electroweak interaction
polarization: asymmetry
Newport News CEBAF Linac

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Figures(0)

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