A search for the very rare B*0 → μ+ μ− and B*0s → μ+ μ− decays is conducted by analysing the Bc+ → π+ μ+ μ− process. The analysis uses proton-proton collision data collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 fb^−1. The signal signatures correspond to simultaneous peaks in the μ+ μ− and π+ μ+ μ− invariant masses. No evidence for an excess of events over background is observed for either signal decay mode. Upper limits at the 90% confidence level are set on the branching fractions relative to that for Bc+ →J/ψ π+ decays, R_{B*0(μ+ μ−) π+ /J/ψ π+} < 3.8 × 10^−5 and R_{B*0s(μ+ μ−)π+ / J/ψ π+} < 5.0 × 10^−5.

Aaij, R., Abdelmotteleb, A.S.W., Beteta, C.A., Abudinén, F., Ackernley, T., Adefisoye, A.A., et al. (2025). Search for B*0(s) → μ+ μ− in Bc+ → π+ μ+ μ− decays. EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 85(1), 1-16 [10.1140/epjc/s10052-024-13573-0].

Search for B*0(s) → μ+ μ− in Bc+ → π+ μ+ μ− decays

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;
2025

Abstract

A search for the very rare B*0 → μ+ μ− and B*0s → μ+ μ− decays is conducted by analysing the Bc+ → π+ μ+ μ− process. The analysis uses proton-proton collision data collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 fb^−1. The signal signatures correspond to simultaneous peaks in the μ+ μ− and π+ μ+ μ− invariant masses. No evidence for an excess of events over background is observed for either signal decay mode. Upper limits at the 90% confidence level are set on the branching fractions relative to that for Bc+ →J/ψ π+ decays, R_{B*0(μ+ μ−) π+ /J/ψ π+} < 3.8 × 10^−5 and R_{B*0s(μ+ μ−)π+ / J/ψ π+} < 5.0 × 10^−5.
2025
Aaij, R., Abdelmotteleb, A.S.W., Beteta, C.A., Abudinén, F., Ackernley, T., Adefisoye, A.A., et al. (2025). Search for B*0(s) → μ+ μ− in Bc+ → π+ μ+ μ− decays. EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 85(1), 1-16 [10.1140/epjc/s10052-024-13573-0].
Aaij, R.; Abdelmotteleb, A. S. W.; Beteta, C. Abellan; Abudinén, F.; Ackernley, T.; Adefisoye, A. A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapopoul...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1006868
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