We report on a search for a resonance X decaying to a pair of muons in e+e-→μ+μ-X events in the 0.212-9.000 GeV/c2 mass range, using 178 fb-1 of data collected by the Belle II experiment at the SuperKEKB collider at a center of mass energy of 10.58 GeV. The analysis probes two different models of X beyond the standard model: a Z′ vector boson in the Lμ-Lτ model and a muonphilic scalar. We observe no evidence for a signal and set exclusion limits at the 90% confidence level on the products of cross section and branching fraction for these processes, ranging from 0.046 fb to 0.97 fb for the Lμ-Lτ model and from 0.055 fb to 1.3 fb for the muonphilic scalar model. For masses below 6 GeV/c2, the corresponding constraints on the couplings of these processes to the standard model range from 0.0008 to 0.039 for the Lμ-Lτ model and from 0.0018 to 0.040 for the muonphilic scalar model. These are the first constraints on the muonphilic scalar from a dedicated search.

Search for a μ+μ- resonance in four-muon final states at Belle II / Adachi, I., Adamczyk, K., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Aloisio, A., Anh Ky, N., Asner, D.M., Atmacan, H., Aushev, V., Aversano, M., Ayad, R., Babu, V., Bae, H., Bahinipati, S., Bambade, P., Banerjee, S., Bansal, S., Barrett, M., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 109:11(2024). [10.1103/PhysRevD.109.112015]

Search for a μ+μ- resonance in four-muon final states at Belle II

Aloisio A.;Campajola M.;De Nardo G.;Di Capua F.;Gaudino G.;Giordano R.;Merola M.;Mirra M.;Pardi S.;Russo Guido;
2024

Abstract

We report on a search for a resonance X decaying to a pair of muons in e+e-→μ+μ-X events in the 0.212-9.000 GeV/c2 mass range, using 178 fb-1 of data collected by the Belle II experiment at the SuperKEKB collider at a center of mass energy of 10.58 GeV. The analysis probes two different models of X beyond the standard model: a Z′ vector boson in the Lμ-Lτ model and a muonphilic scalar. We observe no evidence for a signal and set exclusion limits at the 90% confidence level on the products of cross section and branching fraction for these processes, ranging from 0.046 fb to 0.97 fb for the Lμ-Lτ model and from 0.055 fb to 1.3 fb for the muonphilic scalar model. For masses below 6 GeV/c2, the corresponding constraints on the couplings of these processes to the standard model range from 0.0008 to 0.039 for the Lμ-Lτ model and from 0.0018 to 0.040 for the muonphilic scalar model. These are the first constraints on the muonphilic scalar from a dedicated search.
2024
Search for a μ+μ- resonance in four-muon final states at Belle II / Adachi, I., Adamczyk, K., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Aloisio, A., Anh Ky, N., Asner, D.M., Atmacan, H., Aushev, V., Aversano, M., Ayad, R., Babu, V., Bae, H., Bahinipati, S., Bambade, P., Banerjee, S., Bansal, S., Barrett, M., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 109:11(2024). [10.1103/PhysRevD.109.112015]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/968952
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