The rare electromagnetic J/ψ → μ+μ−μ+μ− decay is observed with a significance greatly exceeding the discovery threshold, using proton-proton collision data collected by the LHCb experiment during 2016–2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1. The rate of this decay is measured relative to that of the J/ψ → μ+μ− mode. Using the QED model for the four-muon decay in the efficiency estimation, its branching fraction is determined to be (Formula presented.) where the uncertainties are statistical, systematic and due to the uncertainty on the branching fraction of the J/ψ → μ+μ− decay.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2024). Study of the rare decay J/ψ → μ+μ−μ+μ−. JOURNAL OF HIGH ENERGY PHYSICS, 2024(12) [10.1007/JHEP12(2024)062].

Study of the rare decay J/ψ → μ+μ−μ+μ−

Anelli A.;Borsato M.;Calvi M.;Capelli S.;Carniti P.;Fazzini D.;Garcia Pardinas J.;Kirsebom V. S.;Malentacca L.;Martinelli M.;Minotti A.;Pizzichemi M.;Salomoni M.;
2024

Abstract

The rare electromagnetic J/ψ → μ+μ−μ+μ− decay is observed with a significance greatly exceeding the discovery threshold, using proton-proton collision data collected by the LHCb experiment during 2016–2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1. The rate of this decay is measured relative to that of the J/ψ → μ+μ− mode. Using the QED model for the four-muon decay in the efficiency estimation, its branching fraction is determined to be (Formula presented.) where the uncertainties are statistical, systematic and due to the uncertainty on the branching fraction of the J/ψ → μ+μ− decay.
Articolo in rivista - Articolo scientifico
Flavour Physics; Hadron-Hadron Scattering; Quarkonium; Rare Decay;
English
10-dic-2024
2024
2024
12
62
open
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2024). Study of the rare decay J/ψ → μ+μ−μ+μ−. JOURNAL OF HIGH ENERGY PHYSICS, 2024(12) [10.1007/JHEP12(2024)062].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/578821
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