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Type: Journal article
Title: Electromagnetic contribution to the proton-neutron mass splitting
Author: Thomas, A.
Wang, X.
Young, R.
Citation: Physical Review C: Nuclear Physics, 2015; 91(1):015209-1-015209-4
Publisher: American Physical Society
Issue Date: 2015
ISSN: 0556-2813
Statement of
A. W. Thomas, X. G. Wang, and R. D. Young
Abstract: We study the electromagnetic contribution to the proton-neutronmass splitting by combining lattice simulations and the modified Cottingham sum rule of Walker-Loud, Carlson, and Miller. This analysis yields an estimate of the isovector nucleon magnetic polarizability as a function of pion mass. The physical value, obtained by chiral extrapolation to the physical pion mass, is βp-n= (−1.12 ± 0.40) × 10−4 fm3,, which is in agreement with the empirical result, albeit with a somewhat smaller error. As a result, we find δMγ p-n= 1.04 ± 0.11 MeV, which represents a significant improvement in precision.
Rights: ©2015 American Physical Society
DOI: 10.1103/PhysRevC.91.015209
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