Two-photon exchange correction to muon-proton elastic scattering at low momentum transfer

被引：34
|
作者：
Tomalak, Oleksandr [1 ,2 ,3 ]
Vanderhaeghen, Marc [1 ,2 ]
机构：
[1] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55122 Mainz, Germany
[2] Johannes Gutenberg Univ Mainz, PRISMA Cluster Excellence, D-55122 Mainz, Germany
[3] Taras Shevchenko Natl Univ Kyiv, Dept Phys, Kiev, Ukraine
来源：
EUROPEAN PHYSICAL JOURNAL C | 2016年 / 76卷 / 03期
关键词：
CHIRAL PERTURBATION-THEORY; HYDROGEN LAMB SHIFT; R=SIGMA-L/SIGMA-T; POLARIZABILITY CONTRIBUTION; NUCLEON POLARIZABILITIES; CROSS-SECTIONS; ELECTRONS;
D O I：
10.1140/epjc/s10052-016-3966-3
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We evaluate the two-photon exchange (TPE) correction to the muon-proton elastic scattering at small momentum transfer. Besides the elastic (nucleon) intermediate state contribution, which is calculated exactly, we account for the inelastic intermediate states by expressing the TPE process approximately through the forward doubly virtual Compton scattering. The input in our evaluation is given by the unpolarized proton structure functions and by one subtraction function. For the latter, we provide an explicit evaluation based on a Regge fit of high-energy proton structure function data. It is found that, for the kinematics of the forthcoming muon-proton elastic scattering data of the MUSE experiment, the elastic TPE contribution dominates, and the size of the inelastic TPE contributions is within the anticipated error of the forthcoming data.
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页数：16
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