The first four-dimensional amplitude analysis of the B+ -> Psi(2S)K0Spi+ decay is performed with proton-proton collision data collected by the LHCb experiment at \sqrt{s} = 13 TeV, corresponding to an integrated luminosity of 5.4 fb-1. The data cannot be fully explained by B+ -> Psi(2S)K*+ contributions alone. A significantly better description of the data is obtained by adding a T+cc contribution decaying to Psi(2S)pi+. The properties of the T+cc structure are consistent with the exotic state Tcc1(4430)+ reported in the isospin-related B0 -> Psi(2S)K-pi+ decay. Effects of a possible Tcc1(4430)+ -> D*1 (2600)0D+ decay mode on the Tcc1(4430)+-> Psi(2S)pi+ mass distribution are investigated through a Flatte' 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 Tcc1(4430)+ Structure in B+ -> Psi(2S)K0Spi+ Decays
Celestino I.Membro del Collaboration Group
;Cordova G.Membro del Collaboration Group
;Kleijne N.Membro del Collaboration Group
;Morello M. J.Membro del Collaboration Group
;Passaro D.Membro del Collaboration Group
;Pica L.Membro del Collaboration Group
;Riccardi D.;Xu A.Membro del Collaboration Group
;
2026
Abstract
The first four-dimensional amplitude analysis of the B+ -> Psi(2S)K0Spi+ decay is performed with proton-proton collision data collected by the LHCb experiment at \sqrt{s} = 13 TeV, corresponding to an integrated luminosity of 5.4 fb-1. The data cannot be fully explained by B+ -> Psi(2S)K*+ contributions alone. A significantly better description of the data is obtained by adding a T+cc contribution decaying to Psi(2S)pi+. The properties of the T+cc structure are consistent with the exotic state Tcc1(4430)+ reported in the isospin-related B0 -> Psi(2S)K-pi+ decay. Effects of a possible Tcc1(4430)+ -> D*1 (2600)0D+ decay mode on the Tcc1(4430)+-> Psi(2S)pi+ mass distribution are investigated through a Flatte' 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.



