Document Type
Article
Department/Program
Physics
Journal Title
Physical Review Letters
Pub Date
2012
Volume
108
Issue
23
Abstract
We update the determination of the isovector nucleon electromagnetic self-energy, valid to leading order in QED. A technical oversight in the literature concerning the elastic contribution to Cottingham's formula is corrected, and modern knowledge of the structure functions is used to precisely determine the inelastic contribution. We find delta M-p-n(gamma) = 1.30(03)(47) MeV. The largest uncertainty arises from a subtraction term required in the dispersive analysis, which can be related to the isovector magnetic polarizability. With plausible model assumptions, we can combine our calculation with additional input from lattice QCD to constrain this polarizability as: beta(p-n) = -0.87(85) x 10(-4) fm(3).
Recommended Citation
Walker-Loud, Andre; Miller, Gerald A.; Walker-Loud, Andre; and Carlson, Carl E., Electromagnetic Self-Energy Contribution to M-p-M-n and the Isovector Nucleon Magnetic Polarizability (2012). Physical Review Letters, 108(23).
10.1103/PhysRevLett.108.232301
DOI
10.1103/PhysRevLett.108.232301
