Electromagnetic Contribution to the Proton-Neutron Mass Splitting
Nuclear Theory
2015-03-05 v1 High Energy Physics - Lattice
High Energy Physics - Phenomenology
Abstract
We study the electromagnetic contribution to the proton-neutron mass 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 , which is in agreement with the empirical result, albeit with a somewhat smaller error. As a result, we find , which represents a significant improvement in precision.
Cite
@article{arxiv.1406.4579,
title = {Electromagnetic Contribution to the Proton-Neutron Mass Splitting},
author = {A. W. Thomas and X. G. Wang and R. D. Young},
journal= {arXiv preprint arXiv:1406.4579},
year = {2015}
}