Measurements of the Proton Elastic-Form-Factor Ratio μpGEp/GMp at Low Momentum Transfer

G. Ron et al. (Jefferson Lab Hall A Collaboration)
Phys. Rev. Lett. 99, 202002 – Published 13 November 2007

Abstract

High-precision measurements of the proton elastic form-factor ratio, μpGEp/GMp, have been made at four-momentum transfer, Q2, values between 0.2 and 0.5GeV2. The new data, while consistent with previous results, clearly show a ratio less than unity and significant differences from the central values of several recent phenomenological fits. By combining the new form-factor ratio data with an existing cross-section measurement, one finds that in this Q2 range the deviation from unity is primarily due to GEp being smaller than expected.

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  • Received 4 June 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.202002

©2007 American Physical Society

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Vol. 99, Iss. 20 — 16 November 2007

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