A study of B+→ J/ψηK+ decays, followed by J/ψ → μ+μ− and η → γγ, 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/ψη mass spectrum is investigated for contributions from charmonia and charmonium-like states. Evidence is found for the B+→ (ψ2(3823) → J/ψη)K+ and B+→ (ψ(4040) → J/ψη)K+ decays with significance of 3.4 and 4.7 standard deviations, respectively. This constitutes the first evidence for the ψ2(3823) → J/ψη decay.

(2022). Study of charmonium and charmonium-like contributions in B+ → J/ψηK+ decays. JOURNAL OF HIGH ENERGY PHYSICS, 2022(4) [10.1007/JHEP04(2022)046].

Study of charmonium and charmonium-like contributions in B+ → J/ψηK+ decays

Calvi, M.;Capelli, S.;Carniti, P.;Fazzini, D.;Garcia Pardinas J.;Gotti, C.;Martinazzoli, L.;Martinelli, M.;Meloni, S.;Minotti, A.;Petruzzo, M.;Pizzichemi, M.;Shields, E. B.;
2022

Abstract

A study of B+→ J/ψηK+ decays, followed by J/ψ → μ+μ− and η → γγ, 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/ψη mass spectrum is investigated for contributions from charmonia and charmonium-like states. Evidence is found for the B+→ (ψ2(3823) → J/ψη)K+ and B+→ (ψ(4040) → J/ψη)K+ decays with significance of 3.4 and 4.7 standard deviations, respectively. This constitutes the first evidence for the ψ2(3823) → J/ψη decay.
Articolo in rivista - Articolo scientifico
Scientifica
B Physics; Branching fraction; Hadron-Hadron Scattering; Quarkonium;
English
(2022). Study of charmonium and charmonium-like contributions in B+ → J/ψηK+ decays. JOURNAL OF HIGH ENERGY PHYSICS, 2022(4) [10.1007/JHEP04(2022)046].
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