A study of Bc+ → χc π+ decays is reported using proton-proton collision data, collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb^−1. The decay Bc+ → χc2 π+ is observed for the first time, with a significance exceeding seven standard deviations. The relative branching fraction with respect to the Bc+ → J/ψ π+ decay is measured to be B(Bc+ → χc2 π+) / B(Bc+ → J/ψ π+) = 0.37 ± 0.06 ± 0.02 ± 0.01, where the first uncertainty is statistical, the second is systematic, and the third is due to the knowledge of the χc2 → J/ψ γ branching fraction. No significant Bc+ → χc1 π+ signal is observed and an upper limit for the relative branching fraction for the Bc+ → χc1 π+ and Bc+ → χc2 π+ decays of B(Bc+ → χc1 π+) / B(Bc+ → χc2 π+) < 0.49 is set at the 90% confidence level.

Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A.A., et al. (2024). Study of Bc+ → χc π+ decays. JOURNAL OF HIGH ENERGY PHYSICS, 2024(2), 0-29 [10.1007/jhep02(2024)173].

Study of Bc+ → χc π+ decays

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;
2024

Abstract

A study of Bc+ → χc π+ decays is reported using proton-proton collision data, collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb^−1. The decay Bc+ → χc2 π+ is observed for the first time, with a significance exceeding seven standard deviations. The relative branching fraction with respect to the Bc+ → J/ψ π+ decay is measured to be B(Bc+ → χc2 π+) / B(Bc+ → J/ψ π+) = 0.37 ± 0.06 ± 0.02 ± 0.01, where the first uncertainty is statistical, the second is systematic, and the third is due to the knowledge of the χc2 → J/ψ γ branching fraction. No significant Bc+ → χc1 π+ signal is observed and an upper limit for the relative branching fraction for the Bc+ → χc1 π+ and Bc+ → χc2 π+ decays of B(Bc+ → χc1 π+) / B(Bc+ → χc2 π+) < 0.49 is set at the 90% confidence level.
2024
Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A.A., et al. (2024). Study of Bc+ → χc π+ decays. JOURNAL OF HIGH ENERGY PHYSICS, 2024(2), 0-29 [10.1007/jhep02(2024)173].
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; 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/11585/1004985
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