Study of B_c⁺ → χ_c π⁺ decays

2023/12/20 by LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1073 · 1 voice
Physics and Astronomy · #hep-ex

paper · pdf · doi:10.1007/jhep02(2024)173

arxiv published 2023/12/20 · arxiv updated 2024/03/01

Abstract

A study of B_c⁺ → χ_c 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 9fb^-1. The decay B_c⁺ → χ_c2 π⁺ is observed for the first time, with a significance exceeding seven standard deviations. The relative branching fraction with respect to the B_c⁺ → J/ψπ⁺ decay is measured to be \fracB_B_c⁺ → χ_c2 π⁺ B_{Bc⁺ → J/ψπ⁺} = 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 χ_c → J/ψγ branching fraction. No significant B_c⁺ → χ_c1 π⁺ signal is observed and an upper limit for the relative branching fraction for the B_c⁺ → χ_c1 π⁺ and B_c⁺ → χ_c2 π⁺ decays of \fracB_B_c⁺ → χ_c1 π⁺ B_B_c⁺ → χ_c2 π⁺ < 0.49 is set at the 90% confidence level.

Discussions

• Study of Bc⁺→χcπ⁺ decays arxiv.org/abs/2312.12987 - The decay B+c→χc2π+ is observed for the first time, with a significance exceeding seven standard deviations. [bsky, 2 points, 0 comments]

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