Resonant structures in the dipion mass spectrum from χc1(3872)→π+π-J/ψ decays, produced via B+→K+χc1(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 χc1(3872)→ωJ/ψ decay is established for the first time, (21.4±2.3±2.0)%, with a significance of more than 7.1σ. The amplitude of isospin violating decay, χc1(3872)→ρ0J/ψ, relative to isospin conserving decay, χc1(3872)→ωJ/ψ, 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- J/\psi decays [Observation of sizeable ? contribution to?c1(3872) ? p+ p- J=? decays] / R. Aaij, A. . .A.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 108:1(2023 Jul 27), pp. L011103.1-L011103.12. [10.1103/PhysRevD.108.L011103]

Observation of sizeable \omega contribution to \chi_{c1}(3872) ->\pi^+ \pi- J/\psi decays [Observation of sizeable ? contribution to?c1(3872) ? p+ p- J=? decays]

M. Lazzaroni;D. Marangotto;A. Merli;N. Neri;M. Petruzzo;E. Spadaro Norella;
2023

Abstract

Resonant structures in the dipion mass spectrum from χc1(3872)→π+π-J/ψ decays, produced via B+→K+χc1(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 χc1(3872)→ωJ/ψ decay is established for the first time, (21.4±2.3±2.0)%, with a significance of more than 7.1σ. The amplitude of isospin violating decay, χc1(3872)→ρ0J/ψ, relative to isospin conserving decay, χc1(3872)→ωJ/ψ, is properly determined, and it is a factor of 6 larger than expected for a pure charmonium state.
Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
27-lug-2023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1025052
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