Observation of the $B_c^+ \to J/\psi \pi^+ \pi^0$ decay

Journal of High Energy Physics. 2024. Vol. 2024. Article 151.

Aaij R., Abdelmotteleb A. S., Abellan Beteta C., Abudinén F., Ackernley T., Adams J. A., Adefisoye A. A., V. Bocharnikov, A. Boldyrev, M. Hushchyn, F. Ratnikov, A. Ryzhikov

The first observation of the Bc+→J/ψπ+π0 decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of 9 fb−1, collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV. The ratio of its branching fraction relative to the Bc+→J/ψπ+ channel is measured to be

BBc+→J/ψπ+π0BBc+→J/ψπ+=2.80±0.15±0.11±0.16,

where the first uncertainty is statistical, the second systematic and the third related to imprecise knowledge of the branching fractions for B+ → J/ψK*+ and Bc+→J/ψπ+ decays, which are used to determine the π0 detection efficiency. The π+π0 mass spectrum is found to be consistent with the dominance of an intermediate ρ+ contribution in accordance with a model based on QCD factorisation.

Keywords: машинное обучение, анализ данных, QCD, новая физика, глубокое обучение, applied data analysis, B physics, Hadron-Hadron Scattering, искуственный интеллект

Publication based on the results of: Neuromorphic optimization of complex experimental setups at dynamically changing quality metrics and boundary conditions (2024)