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Reanalysis of Proton Form Factor Ratio Data at $\mathbf{Q^2 =}$ 4.0, 4.8, and 5.6 GeV$\mathbf{^2}$

Abstract : Recently published measurements of the proton electromagnetic form factor ratio $R = \mu_p G_{Ep}/G_{Mp}$ at momentum transfers $Q^2$ up to 8.5 GeV$^2$ in Jefferson Lab Hall C deviate from the linear trend of previous measurements in Jefferson Lab Hall A, favoring a slower rate of decrease of $R$ with $Q^2$. While statistically compatible in the region of overlap with Hall A, the Hall C data hint at a systematic difference between the two experiments. This possibility was investigated in a reanalysis of the Hall A data. We find that the original analysis underestimated the background in the selection of elastic events. The application of an additional cut to further suppress the background increases the results for $R$, improving the consistency between Halls A and C.
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http://hal.in2p3.fr/in2p3-00575008
Contributor : Jeanine Pellet <>
Submitted on : Wednesday, March 9, 2011 - 12:28:20 PM
Last modification on : Wednesday, September 16, 2020 - 4:08:31 PM

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A. J. R. Puckett, E. J. Brash, O. Gayou, M. K. Jones, L. Pentchev, et al.. Reanalysis of Proton Form Factor Ratio Data at $\mathbf{Q^2 =}$ 4.0, 4.8, and 5.6 GeV$\mathbf{^2}$. Physical Review C, American Physical Society, 2012, 85, pp.045203. ⟨10.1103/PhysRevC.85.045203⟩. ⟨in2p3-00575008⟩

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