The first observation of the Bc+ → J/ψ π+ 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/ψ π+ channel is measured to be B(Bc+ → J/ψ π+ π0)/B(Bc+ → J/ψ π+) = 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/ψ K*+ and B+ → J/ψ π+ 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.

Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adams, J.A., et al. (2024). Observation of the Bc+ → J/ψ π+ π0 decay. JOURNAL OF HIGH ENERGY PHYSICS, 2024(4), 0-27 [10.1007/jhep04(2024)151].

Observation of the Bc+ → J/ψ π+ π0 decay

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

Abstract

The first observation of the Bc+ → J/ψ π+ 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/ψ π+ channel is measured to be B(Bc+ → J/ψ π+ π0)/B(Bc+ → J/ψ π+) = 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/ψ K*+ and B+ → J/ψ π+ 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.
2024
Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adams, J.A., et al. (2024). Observation of the Bc+ → J/ψ π+ π0 decay. JOURNAL OF HIGH ENERGY PHYSICS, 2024(4), 0-27 [10.1007/jhep04(2024)151].
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adams, J. A.; Adefisoye, A. A.; Adeva, B.; Adinolfi, M.; Adlarson,...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1005606
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