Sensitivity of the η (') →π0γγ and η' →ηγγ decays to a sub-GeV leptophobic U (1)B boson
The sensitivity of the rare decays η(')→π0γγ and η'→ηγγ to signatures of a leptophobic B boson in the MeV-GeV mass range is analyzed in this work. By adding an explicit B-boson resonance exchange, η→Bγ→π0γγ, to the Standard Model contributions from vector and scalar meson exchanges, and em...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:320678 |
| Acceso en línea: | https://ddd.uab.cat/record/320678 https://dx.doi.org/urn:doi:10.1103/PhysRevD.106.114007 |
| Access Level: | acceso abierto |
| Sumario: | The sensitivity of the rare decays η(')→π0γγ and η'→ηγγ to signatures of a leptophobic B boson in the MeV-GeV mass range is analyzed in this work. By adding an explicit B-boson resonance exchange, η→Bγ→π0γγ, to the Standard Model contributions from vector and scalar meson exchanges, and employing experimental data for the associated branching ratios, it allows us to improve the current constraints on the B-boson mass mB and coupling to Standard Model particles αB. From these constraints and the analysis of the available experimental γγ invariant mass distribution, we show that a B-boson signature in the resonant mass range mπ0≲mB≲mη is strongly suppressed and would be very difficult to experimentally identify, assuming that the leptophobic B boson only decays to Standard Model particles. In contrast, the limits outside this mass window are less stringent and the corresponding t- and u-channel signatures may still be observable in the data, as it occurs with the nonresonant Standard Model ρ, ω and φ meson exchanges. In addition, we make use of experimental data from the η'→π0γγ and η'→ηγγ decays to explore larger B-boson masses. Our results are relevant for the B-boson search programs at existing and forthcoming light-meson facilities, such as KLOE(-II) and Jefferson Lab Eta Factory experiments. |
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