A study of Bc+→χcπ+ 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+→χc2π+ is observed for the first time, with a significance exceeding seven standard deviations. The relative branching fraction with respect to the Bc+→J/ψπ+ decay is measured to be (Formula presented.) where the first uncertainty is statistical, the second is systematic, and the third is due to the knowledge of the χc2→ J/ψγ branching fraction. No significant Bc+→χc1π+ signal is observed and an upper limit for the relative branching fraction for the Bc+→χc1π+ and Bc+→χc2π+ decays of (Formula presented.) is set at the 90% confidence level.

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

Study of Bc⁺ → χc π⁺ decays

Anelli, A.;Borsato, M.;Calvi, M.;Capelli, S.;Carniti, P.;Fazzini, D.;García Pardiñas, J.;Gotti, C.;Kirsebom, V. S.;Malentacca, L.;Martinazzoli, L.;Martinelli, M.;Minotti, A.;Pizzichemi, M.;Salomoni, M.;Shields, E. B.;
2024

Abstract

A study of Bc+→χcπ+ 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+→χc2π+ is observed for the first time, with a significance exceeding seven standard deviations. The relative branching fraction with respect to the Bc+→J/ψπ+ decay is measured to be (Formula presented.) where the first uncertainty is statistical, the second is systematic, and the third is due to the knowledge of the χc2→ J/ψγ branching fraction. No significant Bc+→χc1π+ signal is observed and an upper limit for the relative branching fraction for the Bc+→χc1π+ and Bc+→χc2π+ decays of (Formula presented.) is set at the 90% confidence level.
Articolo in rivista - Articolo scientifico
B Physics; Branching fraction; Hadron-Hadron Scattering;
English
22-feb-2024
2024
2024
2
173
open
Null, N., Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., et al. (2024). Study of Bc⁺ → χc π⁺ decays. JOURNAL OF HIGH ENERGY PHYSICS, 2024(2) [10.1007/jhep02(2024)173].
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