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.File | Dimensione | Formato | |
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PhysRevD.108.L011103_compressed.pdf
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