Lepton-Flavor-Violating ALP Signals with TeV-Scale Muon Beams
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| Format: | Preprint |
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2024
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| _version_ | 1866917826451734528 |
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| author | Batell, Brian Davoudiasl, Hooman Marcarelli, Roman Neil, Ethan T. Trojanowski, Sebastian |
| author_facet | Batell, Brian Davoudiasl, Hooman Marcarelli, Roman Neil, Ethan T. Trojanowski, Sebastian |
| contents | We explore the feasibility of using TeV-energy muons to probe lepton-flavor-violating (LFV) processes mediated by an axion-like particle (ALP) $a$ with mass $\mathcal{O}(10~\textrm{GeV})$. We focus on $μτ$ LFV interactions and assume that the ALP is coupled to a dark state $χ$, which can be either less or more massive than $a$. Such a setup is demonstrated to be consistent with $χ$ being a candidate for dark matter, in the experimentally relevant regime of parameters. We consider the currently operating NA64-$μ$ experiment and proposed FASER$ν$2 detector as both the target and the detector for the process $μA \to τA\, a$, where $A$ is the target nucleus. We also show that a possible future active muon fixed-target experiment operating at a 3 TeV muon collider or in its preparatory phase can provide an impressive reach for the LFV process considered, with future FASER$ν$2 data providing a pilot study towards that goal. The implications of the muon anomalous magnetic moment $(g-2)_μ$ measurements for the underlying model, in case of a positive signal, are also examined, and a sample UV completion is outlined. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2407_15942 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Lepton-Flavor-Violating ALP Signals with TeV-Scale Muon Beams Batell, Brian Davoudiasl, Hooman Marcarelli, Roman Neil, Ethan T. Trojanowski, Sebastian High Energy Physics - Phenomenology High Energy Physics - Experiment We explore the feasibility of using TeV-energy muons to probe lepton-flavor-violating (LFV) processes mediated by an axion-like particle (ALP) $a$ with mass $\mathcal{O}(10~\textrm{GeV})$. We focus on $μτ$ LFV interactions and assume that the ALP is coupled to a dark state $χ$, which can be either less or more massive than $a$. Such a setup is demonstrated to be consistent with $χ$ being a candidate for dark matter, in the experimentally relevant regime of parameters. We consider the currently operating NA64-$μ$ experiment and proposed FASER$ν$2 detector as both the target and the detector for the process $μA \to τA\, a$, where $A$ is the target nucleus. We also show that a possible future active muon fixed-target experiment operating at a 3 TeV muon collider or in its preparatory phase can provide an impressive reach for the LFV process considered, with future FASER$ν$2 data providing a pilot study towards that goal. The implications of the muon anomalous magnetic moment $(g-2)_μ$ measurements for the underlying model, in case of a positive signal, are also examined, and a sample UV completion is outlined. |
| title | Lepton-Flavor-Violating ALP Signals with TeV-Scale Muon Beams |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2407.15942 |