Lepton mass effects for beam-normal single-spin asymmetry in elastic muon-proton scattering
Lepton mass effects for beam-normal single-spin asymmetry in elastic muon-proton scattering
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DOI：
10.1103/physrevd.100.096020
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发表时间：
2019-05
影响因子：
5
通讯作者：
O. Koshchii;A. Afanasev
中科院分区：
文献类型：
--
作者：
O. Koshchii;A. Afanasev
在没有采用超相对论近似的情况下，我们估算了轻子-质子弹性散射中的束流-法线单自旋不对称性。我们的计算对于分析能量在几百MeV及以下的Muon散射是相关的--当Muon质量的影响变得重要时。在这样的能量下，Muon束的横向极化预计将对弹性Muon-质子散射的精确测量的系统不确定度有很大贡献。我们使用PSI缪斯实验的一个例子来评估这种系统学。缪斯的介子不对称性在运动学上估计约为0.1，是向后半球散射的最大值。
We estimate the beam-normal single-spin asymmetry in elastic lepton-proton scattering without employing the ultrarelativistic approximation. Our calculation is relevant for analyses of muon scattering at energies of few hundred MeV and below -- when effects of the muon mass become essential. At such energies, the transverse polarization of the muon beam is expected to contribute significantly to the systematic uncertainty of precision measurements of elastic muon-proton scattering. We evaluate such systematics using an example of the MUSE experiment at PSI. The muon asymmetry is estimated at about 0.1\% in kinematics of MUSE and it is the largest for scattering into a backward hemisphere.