论文标题
CERN的Muone实验的新物理学
New physics at the MUonE experiment at CERN
论文作者
论文摘要
确认长期存在的MUON $ G $ -2差异需要实验和理论进步。在理论方面，耐药校正受到了仔细的审查，因为它们引起了标准模型预测的主要不确定性。最近，已在CERN提出了Muone实验，以通过测量Muon-Electron散射的差分横截面来确定对MUON $ G $ -2的领先耐药性贡献的新确定。在该实验中预期的精度提出了一个问题，即可能的新物理（NP）是否会影响其测量值。我们讨论了由于沉重或轻介体而导致的MUON电子碰撞中可能的NP信号，具体取决于它们的质量是高于$ {\ cal O}（1 {\ rm Gev}）$。我们通过有效的现场理论方法以独立于模型的方式分析了前者，而对于后者，我们将重点放在带有光标量和向量玻色子的场景上。使用现有的实验界，我们表明MUON电子碰撞中可能的NP效应有望低于Muone的敏感性。该结果证实并加强了Muone建议的物理案例。
A confirmation of the long-standing muon $g$-2 discrepancy requires both experimental and theoretical progress. On the theory side, the hadronic corrections are under close scrutiny, as they induce the leading uncertainty of the Standard Model prediction. Recently, the MUonE experiment has been proposed at CERN to provide a new determination of the leading hadronic contribution to the muon $g$-2 via the measurement of the differential cross section of muon-electron scattering. The precision expected at this experiment raises the question whether possible new-physics (NP) could affect its measurements. We address this issue studying possible NP signals in muon-electron collisions due to heavy or light mediators, depending on whether their mass is higher or lower than ${\cal O} (1{\rm GeV})$. We analyze the former in a model-independent way via an effective field theory approach, whereas for the latter we focus on scenarios with light scalar and vector bosons. Using existing experimental bounds, we show that possible NP effects in muon-electron collisions are expected to lie below MUonE's sensitivity. This result confirms and reinforces the physics case of the MUonE proposal.
