Resonant structures in the dipion mass spectrum from chi_c1 -> pi+ pi- JPsi decays, produced via B+ -> K+chi_c1(3872) decays, are analyzed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb-1. A sizeable contribution from the isospin conserving chi_c1(3872) -> omega JPsi decay is established for the first time, (21.4 \pm 2.3 \pm 2.0)%, with a significance of more than 7.1sigma. The amplitude of isospin violating decay, chi_c1(3872) -> rho0 JPsi, relative to isospin conserving decay, chi_c1(3872) -> omega JPsi, is properly determined, and it is a factor of 6 larger than expected for a pure charmonium state.

Observation of sizeable omega contribution to chi_c1 (3872) -> pi+ pi- JPsi decays

Bassi, G.
Membro del Collaboration Group
;
Kleijne, N.
Membro del Collaboration Group
;
Lusiani, A.
Membro del Collaboration Group
;
Morello, M.  J.
Membro del Collaboration Group
;
Pica, L.
Membro del Collaboration Group
;
Ribatti, R.
Membro del Collaboration Group
;
2023

Abstract

Resonant structures in the dipion mass spectrum from chi_c1 -> pi+ pi- JPsi decays, produced via B+ -> K+chi_c1(3872) decays, are analyzed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb-1. A sizeable contribution from the isospin conserving chi_c1(3872) -> omega JPsi decay is established for the first time, (21.4 \pm 2.3 \pm 2.0)%, with a significance of more than 7.1sigma. The amplitude of isospin violating decay, chi_c1(3872) -> rho0 JPsi, relative to isospin conserving decay, chi_c1(3872) -> omega JPsi, is properly determined, and it is a factor of 6 larger than expected for a pure charmonium state.
Observation of sizeable ω contribution to χc1 (3872) →π+π-J/ψ decays
2023
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
Particle decays; Quark model; Strong interaction; Charm quark; Hadrons; Mesons; Flavor symmetries
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/149946
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