Electromagnetic Self-Energy Contribution to Mp-Mn and the Isovector Nucleon Magnetic Polarizability

被引：68

作者：

Walker-Loud, Andre ^{[1
,2
]}

Carlson, Carl E. ^{[3
]}

Miller, Gerald A. ^{[1
,4
]}

机构：

[1] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[3] Coll William & Mary, Dept Phys, Williamsburg, VA 23187 USA

[4] Univ Washington, Dept Phys, Seattle, WA 98195 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 23期

基金：

美国国家科学基金会;

关键词：

PROTON MASS DIFFERENCE; ISOSPIN VIOLATION; CHARGE-SYMMETRY; QUARK MASSES; LATTICE QCD; PHYSICS;

D O I：

10.1103/PhysRevLett.108.232301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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).

引用

页数：5

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