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.File in questo prodotto:
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