The B + → Jψη′K + decay is observed for the first time using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb −1. The branching fraction of this decay is measured relative to the known branching fraction of the B + → ψ(2S)K + decay and found to be B(B+→Jψη′K+)B(B+→ψ(2S)K+)=(4.91±0.47±0.29±0.07)×10−2, where the first uncertainty is statistical, the second is systematic and the third is related to external branching fractions. A first look at the J/ψη′ mass distribution is performed and no signal of intermediate resonances is observed.

Observation of the B + → Jψη′K + decay

R. Bolzonella;R. Calabrese;L. Capriotti;V. Cavallini;B. Couturier;M. Fiorini;E. Franzoso;M. Guarise;S. Kotriakhova;E. Luppi;S. Okamura;L. L. Pappalardo;B. Passalacqua;L. Tomassetti;
2023

Abstract

The B + → Jψη′K + decay is observed for the first time using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb −1. The branching fraction of this decay is measured relative to the known branching fraction of the B + → ψ(2S)K + decay and found to be B(B+→Jψη′K+)B(B+→ψ(2S)K+)=(4.91±0.47±0.29±0.07)×10−2, where the first uncertainty is statistical, the second is systematic and the third is related to external branching fractions. A first look at the J/ψη′ mass distribution is performed and no signal of intermediate resonances is observed.
2023
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudin??n, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Afsharnia, H.; Agapopoulou...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2534313
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