Low Q^2 measurements of the proton form factor ratio $mu_p G_E / G_M$
G. Ron, X. Zhan, J. Glister, B. Lee, K. Allada, W. Armstrong, J., Arrington, A. Beck, F. Benmokhtar, B.L. Berman, W. Boeglin, E. Brash, A., Camsonne, J. Calarco, J. P. Chen, S. Choi, E. Chudakov, L. Coman, B. Craver,, F. Cusanno, J. Dumas, C. Dutta, R. Feuerbach, A. Freyberger
TL;DR
This paper provides an updated measurement of the proton form factor ratio at low Q^2, refining previous results to better inform models of proton structure.
Contribution
It introduces improved event selection and background reduction techniques for more accurate low Q^2 measurements of the proton form factor ratio.
Findings
Reduced systematic uncertainty in the form factor ratio
Refined measurements compared to previous analyses
Enhanced understanding of proton spatial distribution
Abstract
We present an updated extraction of the proton electromagnetic form factor ratio, mu_p G_E/G_M, at low Q^2. The form factors are sensitive to the spatial distribution of the proton, and precise measurements can be used to constrain models of the proton. An improved selection of the elastic events and reduced background contributions yielded a small systematic reduction in the ratio mu_p G_E/G_M compared to the original analysis.
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