Model Independent Analysis of the Proton Magnetic Radius

2015/11/02 by Joydeep Roy, Roy, Joydeep, Zachary Epstein +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph

paper · pdf · doi:10.48550/arxiv.1511.00664

7 pages, 1 figure, Presentation at the DPF 2015 Meeting of the American Physical Society Division of Particles and Fields, Ann Arbor, Michigan, August 4-8, 2015

arxiv created 2015/11/02 · arxiv updated 2015/11/03

Abstract

The proton is a fundamental constituent of matter. It is an extended object with finite size that can be inferred with some degree of accuracy from several measurements. Using constraints from the analytic behavior of the form factors we present here a model-independent study that extracts the proton magnetic radius from scattering data. From electron-proton scattering data we find r_M^p = 0.91_-0.06^+0.03 ± 0.02 fm. When we include electron-neutron scattering data and ππ data, we find r_M^p = 0.87_-0.05^+0.04± 0.01 fm and r_M^p =0.87_-0.02^+0.02 fm respectively. The neutron magnetic radius is extracted as r_Mⁿ = 0.89_-0.03^+0.03 fm combining all three data sets.

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