TY - JOUR
T1 - Amplitude analysis of B+ → ψ(2S)K+π+π− decays
AU - LHCb Collaboration
AU - Adinolfi, Marco
AU - Amey, Jake
AU - Cottee Meldrum, Jozie
AU - d’Argent, P.
AU - Ghorbanimoghaddam, Zahra
AU - Lane, R.
AU - Marshall, Alex M
AU - Normand, Camille A
AU - Petridis, Konstantinos A.
AU - Rademacker, Jonas H
AU - Reich, Jake
AU - Solomin, Anatoly
AU - Velthuis, Jaap J
AU - Wang, R.
AU - Westhenry, Benedict D C
AU - Williams, Zak
N1 - Publisher Copyright:
© The Author(s) 2025.
PY - 2025/1/8
Y1 - 2025/1/8
N2 - The first full amplitude analysis of B+ → ψ(2S)K+π+π− decays is performed using proton-proton collision data corresponding to an integrated luminosity of 9 fb−1 recorded with the LHCb detector. The rich K+π+π− spectrum is studied and the branching fractions of the resonant substructure associated with the prominent K1(1270)+ contribution are measured. The data cannot be described by conventional strange and charmonium resonances only. An amplitude model with 53 components is developed comprising 11 hidden-charm exotic hadrons. New production mechanisms for charged charmonium-like states are observed. Significant resonant activity with spin-parity JP = 1+ in the ψ(2S)π+ system is confirmed and a multi-pole structure is demonstrated. The spectral decomposition of the ψ(2S)π+π− invariant-mass structure, dominated by X0 → ψ(2S)ρ(770)0 decays, broadly resembles the J/ψϕ spectrum observed in B+ → J/ψϕK+ decays. Exotic ψ(2S)K+π− resonances are observed for the first time.
AB - The first full amplitude analysis of B+ → ψ(2S)K+π+π− decays is performed using proton-proton collision data corresponding to an integrated luminosity of 9 fb−1 recorded with the LHCb detector. The rich K+π+π− spectrum is studied and the branching fractions of the resonant substructure associated with the prominent K1(1270)+ contribution are measured. The data cannot be described by conventional strange and charmonium resonances only. An amplitude model with 53 components is developed comprising 11 hidden-charm exotic hadrons. New production mechanisms for charged charmonium-like states are observed. Significant resonant activity with spin-parity JP = 1+ in the ψ(2S)π+ system is confirmed and a multi-pole structure is demonstrated. The spectral decomposition of the ψ(2S)π+π− invariant-mass structure, dominated by X0 → ψ(2S)ρ(770)0 decays, broadly resembles the J/ψϕ spectrum observed in B+ → J/ψϕK+ decays. Exotic ψ(2S)K+π− resonances are observed for the first time.
U2 - 10.1007/JHEP01(2025)054
DO - 10.1007/JHEP01(2025)054
M3 - Article (Academic Journal)
SN - 1029-8479
VL - 2025
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 1
M1 - 54
ER -