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arXiv 1405.1600hep-phnucl-th
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μ子-质子弹性散射中的双光子交换修正

Two-photon exchange corrections in elastic muon-proton scattering

O. Tomalak, M. Vanderhaeghen

摘要:

通过考虑所有轻子质量项,我们将双光子交换的一般形式推广到轻子-核子弹性散射。然后,我们进行了数值估计的μ子质子散射在低动量转移鉴于未来的MUSE实验。为了这个目的,我们估计的双光子交换修正μ子质子散射观测值考虑的贡献的质子中间态,预计将占主导地位,在非常低的动量转移。我们发现,在MUSE运动学区,非极化μ子-质子散射截面的双光子交换效应约为0.5%。

英文摘要:

We extend the general formalism of two-photon exchange to elastic lepton-nucleon scattering by accounting for all lepton mass terms. We then perform a numerical estimate of the muon-proton scattering at low momentum transfer in view of the future MUSE experiment. For this purpose, we estimate the two-photon exchange corrections to muon-proton scattering observables by considering the contribution of the proton intermediate state, which is expected to dominate at very low momentum transfers. We find that the two-photon exchange effect to the unpolarized muon- proton scattering cross section in the MUSE kinematical region is of the order of 0.5%.

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