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September 25, 2026
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Study of B+c→χcπ+ decays

Journal of High Energy Physics. 2024. Vol. 2024. No. 2. Article 173.
Aaij R., Abdelmotteleb A. S., Abellan Beteta C., Abudinén F., Ackernley T., Boldyrev A., Bocharnikov V., Hushchyn M., Ratnikov F., Ryzhikov A.

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

BBc+→χc2π+BBc+→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 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

BBc+→χc1π+BBc+→χc2π+=<0.49

is set at the 90% confidence level.

Research target: Computer Science
Language: English
DOI
Keywords: машинное обучениеновая физикаглубокое обучениеB physicsBranching fractionHadron-Hadron Scatteringанализ данных и искусственный интеллект
Publication based on the results of:
Neuromorphic optimization of complex experimental setups at dynamically changing quality metrics and boundary conditions (2024)
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