The first four-dimensional amplitude analysis of the B+ → ψ(2S)K0Sπ+ decay is performed with proton-proton collision data collected by the LHCb experiment at √s = 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1. The data cannot be fully explained by B+ → ψ(2S)K*+ contributions alone. A significantly better description of the data is obtained by adding a T+cc contribution decaying to ψ(2S)π+. The properties of the T+cc structure are consistent with the exotic state Tcc1(4430)+ reported in the isospin-related B0 → ψ(2S)K−π+ decay. Effects of a possible Tcc1(4430)+ → D*1 (2600)0D+ decay mode on the Tcc1(4430)+ → ψ(2S)π+ mass distribution are investigated through a Flatté parametrization, providing constraints on the relative decay strength. A description of the Tcc1(4430)+ structure using the triangle singularity mechanism is studied and also found to be consistent with the data.

Observation and investigation of the Tc(c)over-bar1(4430)+ structure in B+ → ψ(2S)KS0π+ decays] / R. Aaij, A. . .A.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 113:7(2026 Apr 07), pp. L071101.1-L071101.13. [10.1103/rcfs-ynh2]

Observation and investigation of the Tc(c)over-bar1(4430)+ structure in B+ → ψ(2S)KS0π+ decays]

S. Cesare;C. Mancuso;D. Marangotto;N. Neri;G. Tonani;T. Tork;Z. Wang;
2026

Abstract

The first four-dimensional amplitude analysis of the B+ → ψ(2S)K0Sπ+ decay is performed with proton-proton collision data collected by the LHCb experiment at √s = 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1. The data cannot be fully explained by B+ → ψ(2S)K*+ contributions alone. A significantly better description of the data is obtained by adding a T+cc contribution decaying to ψ(2S)π+. The properties of the T+cc structure are consistent with the exotic state Tcc1(4430)+ reported in the isospin-related B0 → ψ(2S)K−π+ decay. Effects of a possible Tcc1(4430)+ → D*1 (2600)0D+ decay mode on the Tcc1(4430)+ → ψ(2S)π+ mass distribution are investigated through a Flatté parametrization, providing constraints on the relative decay strength. A description of the Tcc1(4430)+ structure using the triangle singularity mechanism is studied and also found to be consistent with the data.
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
   European Particle physics Latin American NETwork
   EPLANET
   European Commission
   SEVENTH FRAMEWORK PROGRAMME - SP3-People - Marie-Curie Actions
   246806
7-apr-2026
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1250738
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