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arXiv · 2204.04227

Probing light mediators at the MUonE experiment

Giovanni Grilli di Cortona·Enrico Nardi
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Abstract

The MUonE experiment, that aims to provide a precise measurement of the hadronic vacuum polarization contribution to the muon $g-2$ via elastic muon-electron scattering, has also the potential to explore the parameter space of light new physics. Exploiting the process $\mu^- N \to \mu^- N X$, where $N$ is the target nucleus and X is a new physics light mediator, we demonstrate that MUonE can be sensitive to new regions of parameter space for sub-GeV dark photons. In particular, thanks to its muon beam, MUonE will be able to explore uncharted parameter space regions for the $L_\mu-L_\tau$ model. Finally, we also find that MUonE can probe the parameter space of axion-like particles for different assumptions of the couplings to electrons, muons and photons.

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Giovanni Grilli di Cortona, Enrico Nardi. 2022-04-08. Probing light mediators at the MUonE experiment. https://doi.org/10.1103/physrevd.105.l111701

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