Flavor-changing light bosons with accidental longevity
Abstract We consider a model with a complex scalar field that couples to (e, μ) or (μ, τ) within the “longevity” window: m l 1 − m l 2 m l 1 + m l 2 $$ \left[|{m}_{l_1}-{m}_{l_2}|,{m}_{l_1}+{m}_{l_2}\right] $$ in which l 1 and l 2 are the two different charged leptons. Within such a mass window, eve...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-02-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP02(2023)135 |
| _version_ | 1797779114910810112 |
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| author | Yohei Ema Zhen Liu Kun-Feng Lyu Maxim Pospelov |
| author_facet | Yohei Ema Zhen Liu Kun-Feng Lyu Maxim Pospelov |
| author_sort | Yohei Ema |
| collection | DOAJ |
| description | Abstract We consider a model with a complex scalar field that couples to (e, μ) or (μ, τ) within the “longevity” window: m l 1 − m l 2 m l 1 + m l 2 $$ \left[|{m}_{l_1}-{m}_{l_2}|,{m}_{l_1}+{m}_{l_2}\right] $$ in which l 1 and l 2 are the two different charged leptons. Within such a mass window, even a relatively large coupling (e.g. of the size commensurate with the current accuracy/discrepancy in the muon g − 2 experiment) leads to long lifetimes and macroscopic propagation distance between production and decay points. We propose to exploit several existing neutrino experiments and one future experiment to probe the parameter space of this model. For the μ − e sector, we exploit the muonium decay branching ratio and the production and decay sequence at the LSND experiment, excluding the parametric region suggested by g μ − 2 anomaly. For the τ − μ sector, we analyze three main production mechanisms of scalars at beam dump experiments: the Drell-Yan process, the heavy meson decay, and the muon scattering. We explore the constraints from the past CHARM and NuTeV experiments, and evaluate sensitivity for the proposed beam dump experiment, SHiP. The latter can thoroughly probe the parameter space relevant for the g μ − 2 anomaly. |
| first_indexed | 2024-03-12T23:27:05Z |
| format | Article |
| id | doaj.art-50e8583ec4344c12a33616e74cc2429f |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-03-12T23:27:05Z |
| publishDate | 2023-02-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-50e8583ec4344c12a33616e74cc2429f2023-07-16T11:05:59ZengSpringerOpenJournal of High Energy Physics1029-84792023-02-012023213010.1007/JHEP02(2023)135Flavor-changing light bosons with accidental longevityYohei Ema0Zhen Liu1Kun-Feng Lyu2Maxim Pospelov3William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of MinnesotaSchool of Physics and Astronomy, University of MinnesotaSchool of Physics and Astronomy, University of MinnesotaWilliam I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of MinnesotaAbstract We consider a model with a complex scalar field that couples to (e, μ) or (μ, τ) within the “longevity” window: m l 1 − m l 2 m l 1 + m l 2 $$ \left[|{m}_{l_1}-{m}_{l_2}|,{m}_{l_1}+{m}_{l_2}\right] $$ in which l 1 and l 2 are the two different charged leptons. Within such a mass window, even a relatively large coupling (e.g. of the size commensurate with the current accuracy/discrepancy in the muon g − 2 experiment) leads to long lifetimes and macroscopic propagation distance between production and decay points. We propose to exploit several existing neutrino experiments and one future experiment to probe the parameter space of this model. For the μ − e sector, we exploit the muonium decay branching ratio and the production and decay sequence at the LSND experiment, excluding the parametric region suggested by g μ − 2 anomaly. For the τ − μ sector, we analyze three main production mechanisms of scalars at beam dump experiments: the Drell-Yan process, the heavy meson decay, and the muon scattering. We explore the constraints from the past CHARM and NuTeV experiments, and evaluate sensitivity for the proposed beam dump experiment, SHiP. The latter can thoroughly probe the parameter space relevant for the g μ − 2 anomaly.https://doi.org/10.1007/JHEP02(2023)135Baryon/Lepton Number ViolationDark Matter at CollidersFlavour SymmetriesTheories of Flavour |
| spellingShingle | Yohei Ema Zhen Liu Kun-Feng Lyu Maxim Pospelov Flavor-changing light bosons with accidental longevity Journal of High Energy Physics Baryon/Lepton Number Violation Dark Matter at Colliders Flavour Symmetries Theories of Flavour |
| title | Flavor-changing light bosons with accidental longevity |
| title_full | Flavor-changing light bosons with accidental longevity |
| title_fullStr | Flavor-changing light bosons with accidental longevity |
| title_full_unstemmed | Flavor-changing light bosons with accidental longevity |
| title_short | Flavor-changing light bosons with accidental longevity |
| title_sort | flavor changing light bosons with accidental longevity |
| topic | Baryon/Lepton Number Violation Dark Matter at Colliders Flavour Symmetries Theories of Flavour |
| url | https://doi.org/10.1007/JHEP02(2023)135 |
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