An amplitude analysis of the B+→Ds+Ds-K+ decay is carried out to study for the first time its intermediate resonant contributions, using proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV. A near-threshold peaking structure, referred to as X(3960), is observed in the Ds+Ds- invariant-mass spectrum with significance greater than 12 standard deviations. The mass, width, and the quantum numbers of the structure are measured to be 3956±5±10 MeV, 43±13±8 MeV, and JPC=0++, respectively, where the first uncertainties are statistical and the second systematic. The properties of the new structure are consistent with recent theoretical predictions for a state composed of cc¯ss¯ quarks. Evidence for an additional structure is found around 4140 MeV in the Ds+Ds- invariant mass, which might be caused either by a new resonance with the 0++ assignment or by a J/ψφ↔Ds+Ds- coupled-channel effect.
Observation of a Resonant Structure near the Ds+ Ds- Threshold in the B+ → Ds+ Ds- K+ Decay
Bassi G.Membro del Collaboration Group
;Kleijne N.Membro del Collaboration Group
;Lusiani A.Membro del Collaboration Group
;Morello M. J.Membro del Collaboration Group
;Pica L.Membro del Collaboration Group
;Ribatti R.Membro del Collaboration Group
;
2023
Abstract
An amplitude analysis of the B+→Ds+Ds-K+ decay is carried out to study for the first time its intermediate resonant contributions, using proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV. A near-threshold peaking structure, referred to as X(3960), is observed in the Ds+Ds- invariant-mass spectrum with significance greater than 12 standard deviations. The mass, width, and the quantum numbers of the structure are measured to be 3956±5±10 MeV, 43±13±8 MeV, and JPC=0++, respectively, where the first uncertainties are statistical and the second systematic. The properties of the new structure are consistent with recent theoretical predictions for a state composed of cc¯ss¯ quarks. Evidence for an additional structure is found around 4140 MeV in the Ds+Ds- invariant mass, which might be caused either by a new resonance with the 0++ assignment or by a J/ψφ↔Ds+Ds- coupled-channel effect.File | Dimensione | Formato | |
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PhysRevLett.131.071901_reduced.pdf
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