TY - JOUR
T1 - Observation of sizeable ω contribution to χc1(3872) → π+π−J/ψ decays
AU - LHCb Collaboration
AU - Watson, Nigel
AU - Cooke, Naomi
AU - Williams, Matt
AU - Swallow, Paul
AU - Popov, Dmitry
AU - Duk, Viacheslav
AU - Bifani, Simone
AU - Calladine, Ryan
AU - Sahoo, Niladribihari
AU - Slater, Mark
AU - Plews, Jonathan
AU - Ilten, Philip
AU - Sergi, Antonino
AU - Thompson, Daniel
AU - Johnson, Daniel
PY - 2023/7/1
Y1 - 2023/7/1
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevD.108.L011103
DO - 10.1103/PhysRevD.108.L011103
M3 - Letter
SN - 1550-7998
VL - 108
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 1
M1 - L011103
ER -