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 J^P = 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/ψ ϕ spectrum observed in B+ → J/ψ ϕ K+ decays. Exotic ψ(2S) K+ π− resonances are observed for the first time.

Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A.A., et al. (2025). Amplitude analysis of B+ → ψ(2S) K+ π+ π− decays. JOURNAL OF HIGH ENERGY PHYSICS, 2025(1), 0-68 [10.1007/jhep01(2025)054].

Amplitude analysis of B+ → ψ(2S) K+ π+ π− decays

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;
2025

Abstract

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 J^P = 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/ψ ϕ spectrum observed in B+ → J/ψ ϕ K+ decays. Exotic ψ(2S) K+ π− resonances are observed for the first time.
2025
Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A.A., et al. (2025). Amplitude analysis of B+ → ψ(2S) K+ π+ π− decays. JOURNAL OF HIGH ENERGY PHYSICS, 2025(1), 0-68 [10.1007/jhep01(2025)054].
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A. A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapopoul...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1006249
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