Extraction of the strong neutron-proton mass difference from the charge symmetry breaking in pn → dπ0

被引：46

作者：

Filin, A. ^{[1
,2
,3
]}

Baru, V. ^{[1
,2
,3
]}

Epelbaum, E. ^{[1
,2
,4
,5
]}

Haidenbauer, J. ^{[1
,2
,6
]}

Hanhart, C. ^{[1
,2
,6
]}

Kudryavtsev, A. ^{[3
]}

Meissner, U. -G. ^{[1
,2
,4
,5
,6
]}

机构：

[1] KFA Julich GmbH, Forschungszentrum, Inst Kernphys Theorie, D-52425 Julich, Germany

[2] KFA Julich GmbH, Forschungszentrum, Julich Ctr Hadron Phys, D-52425 Julich, Germany

[3] Inst Theoret & Expt Phys, Moscow 117259, Russia

[4] Univ Bonn, Helmholtz Inst Strahlen & Kernphys Theorie, D-53115 Bonn, Germany

[5] Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany

[6] KFA Julich GmbH, Forschungszentrum, Inst Adv Simulat, D-52425 Julich, Germany

来源：

PHYSICS LETTERS B | 2009年 / 681卷 / 05期

关键词：

CHIRAL PERTURBATION-THEORY; PION-NUCLEON SCATTERING; ISOSPIN VIOLATION; FORCES; QCD; NP;

D O I：

10.1016/j.physletb.2009.10.069

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We perform a complete calculation of charge symmetry breaking effects for the reaction pn --> d pi(0) at leading order in chiral perturbation theory. A new leading-order operator is included. From our analysis we extract delta m(N)(str), the strong contribution to the neutron-proton mass difference. The value obtained, delta m(N)(str) = (1.5 +/- 0.8 (exp.) +/- 0.5 (th.)) MeV, is consistent with the result based on the Cottingham sum rule. This agreement provides a non-trivial test of our current understanding of the chiral structure of QCD. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：423 / 427

页数：5

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