A study of B+ → J/ψ η K+ decays, followed by J/ψ → μ+ μ− and η → γ γ, is performed using a dataset collected with the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb^−1. The J/ψ η mass spectrum is investigated for contributions from charmonia and charmonium-like states. Evidence is found for the B+ → (ψ2(3823) → J/ψ η) K+ and B+ → (ψ(4040) → J/ψ η) K+ decays with significance of 3.4 and 4.7 standard deviations, respectively. This constitutes the first evidence for the ψ2(3823) → J/ψ η decay.

Study of Charmonium and Charmonium-Like Contributions in B+ → J/ψ η K+ Decays

Calabrese, R.;Capriotti, L.;Couturier, B.;Fiorini, M.;Franzoso, E.;Giugliano, C.;Guarise, M.;Kotriakhova, S.;Luppi, E.;Okamura, S.;Pappalardo, L. L.;Passalacqua, B.;Tomassetti, L.;
2022

Abstract

A study of B+ → J/ψ η K+ decays, followed by J/ψ → μ+ μ− and η → γ γ, is performed using a dataset collected with the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb^−1. The J/ψ η mass spectrum is investigated for contributions from charmonia and charmonium-like states. Evidence is found for the B+ → (ψ2(3823) → J/ψ η) K+ and B+ → (ψ(4040) → J/ψ η) K+ decays with significance of 3.4 and 4.7 standard deviations, respectively. This constitutes the first evidence for the ψ2(3823) → J/ψ η decay.
2022
Aaij, R.; Abdelmotteleb, A. S. W.; Abellán Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Agapopoulou, C.; Aidala, C...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2500474
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