Contribution of σ meson exchange to elastic lepton-proton scattering

被引：12

作者：

Koshchii, Oleksandr ^{[1
]}

Afanasev, Andrei ^{[1
]}

机构：

[1] George Washington Univ, Washington, DC 20052 USA

来源：

PHYSICAL REVIEW D | 2016年 / 94卷 / 11期

关键词：

FORM-FACTORS; QUARK-MODEL; CONSTANTS;

D O I：

10.1103/PhysRevD.94.116007

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Lepton mass effects play a decisive role in the description of elastic lepton-proton scattering when the beam's energy is comparable to the mass of the lepton. The future Muon Scattering Experiment (MUSE) experiment, which is devised to solve the "Proton Radius Puzzle," is going to cover the corresponding kinematic region for a scattering of muons by a proton target. We anticipate that helicity-flip meson exchanges will make a difference in the comparison of elastic electron-proton vs muon-proton scattering in MUSE. In this article, we estimate the sigma meson exchange contribution in the t channel. This contribution, mediated by two-photon coupling of sigma, is calculated to be at most similar to 0.1% for muons in the kinematics of MUSE, and it appears to be about 3 orders of magnitude larger than for electrons because of the lepton-mass difference.

引用

页数：8

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