Measurements of the Proton Elastic-Form-Factor Ratio at Low Momentum Transfer
Physical review letters, 2007•APS
High-precision measurements of the proton elastic form-factor ratio, μ p GE p/GM p, have
been made at four-momentum transfer, Q 2, values between 0.2 and 0.5 GeV 2. 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 Q 2 range the deviation from unity is primarily due to GE p being smaller …
been made at four-momentum transfer, Q 2, values between 0.2 and 0.5 GeV 2. 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 Q 2 range the deviation from unity is primarily due to GE p being smaller …
High-precision measurements of the proton elastic form-factor ratio, , have been made at four-momentum transfer, , values between 0.2 and . 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 range the deviation from unity is primarily due to being smaller than expected.
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