Searching for new physics at $μ\rightarrow e$ facilities with $μ^+$ and $π^+$ decays at rest
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| Format: | Preprint |
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2023
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| _version_ | 1866913487472558080 |
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| author | Hill, Richard J. Plestid, Ryan Zupan, Jure |
| author_facet | Hill, Richard J. Plestid, Ryan Zupan, Jure |
| contents | We investigate the ability of $μ\rightarrow e$ facilities, Mu2e and COMET, to probe, or discover, new physics with their detector validation datasets. The validation of the detector response may be performed using a dedicated run with $μ^+$, collecting data below the Michel edge, $E_e\lesssim 52$ MeV; an alternative strategy using $π^+\rightarrow e^+ ν_e$ may also be considered. We focus primarily on a search for a monoenergetic $e^+$ produced via two-body decays $μ^+ \rightarrow e^+ X$ or $π^+\rightarrow e^+X$, with $X$ a light new physics particle. Mu2e can potentially explore new parameter space beyond present astrophysical and laboratory constraints for a set of well motivated models including: axion like particles with flavor violating couplings ($μ^+ \rightarrow e^+ a$), massive $Z'$ bosons ($μ^+ \rightarrow Z' e^+$), and heavy neutral leptons ($π^+\rightarrow e^+N$). The projected sensitivities presented herein can be achieved in a matter of days. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2310_00043 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Searching for new physics at $μ\rightarrow e$ facilities with $μ^+$ and $π^+$ decays at rest Hill, Richard J. Plestid, Ryan Zupan, Jure High Energy Physics - Phenomenology High Energy Physics - Experiment We investigate the ability of $μ\rightarrow e$ facilities, Mu2e and COMET, to probe, or discover, new physics with their detector validation datasets. The validation of the detector response may be performed using a dedicated run with $μ^+$, collecting data below the Michel edge, $E_e\lesssim 52$ MeV; an alternative strategy using $π^+\rightarrow e^+ ν_e$ may also be considered. We focus primarily on a search for a monoenergetic $e^+$ produced via two-body decays $μ^+ \rightarrow e^+ X$ or $π^+\rightarrow e^+X$, with $X$ a light new physics particle. Mu2e can potentially explore new parameter space beyond present astrophysical and laboratory constraints for a set of well motivated models including: axion like particles with flavor violating couplings ($μ^+ \rightarrow e^+ a$), massive $Z'$ bosons ($μ^+ \rightarrow Z' e^+$), and heavy neutral leptons ($π^+\rightarrow e^+N$). The projected sensitivities presented herein can be achieved in a matter of days. |
| title | Searching for new physics at $μ\rightarrow e$ facilities with $μ^+$ and $π^+$ decays at rest |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2310.00043 |