Observation of a resonant structure near the D+sD−s threshold in the B+→D+sD−sK+ decay

Medientyp: E-Artikel

Titel: Observation of a resonant structure near the D+sD−s threshold in the B+→D+sD−sK+ decay

Beteiligte: Aaij, Roel [Verfasser:in]; Archilli, Flavio [Verfasser:in]; Bachmann, Sebastian [Verfasser:in]; Borsato, Martino [Verfasser:in]; Caspary, Rowina [Verfasser:in]; Frau, Giulia [Verfasser:in]; Günther, Paul André [Verfasser:in]; Han, Xiaoxue [Verfasser:in]; Hansmann-Menzemer, Stephanie [Verfasser:in]; Hu, Jiangqiao [Verfasser:in]; Leverington, Blake [Verfasser:in]; Li, Peilian [Verfasser:in]; Marks, Jörg [Verfasser:in]; Unverzagt, Daniel Joachim [Verfasser:in]; Uwer, Ulrich [Verfasser:in]; Witola, Lukas [Verfasser:in]; Zhelezov, Alexey [Verfasser:in]

Erschienen: 14 August 2023

Sprache: Englisch

DOI: 10.1103/PhysRevLett.131.071901

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Anmerkungen: *(LHCb Collaboration): R. Aaij, F. Archilli, S. Bachmann, M. Borsato, R. Caspary, G. Frau, P.A. Günther, X. Han, S. Hansmann-Menzemer, J. Hu, B. Leverington, P. Li, J. Marks, D.J. Unverzagt, U. Uwer, L. Witola, A. Zhelezov [und 1048 Personen]
Im Titel sind die Zeichen + und - hochgestellt sowie der Buchstabe s tiefgestellt

Beschreibung: An amplitude analysis of the B+→D+sD−sK+ 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 D+sD−s 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 c¯cs¯s quarks. Evidence for an additional structure is found around 4140 MeV in the D+sD−s invariant mass, which might be caused either by a new resonance with the 0++ assignment or by a J/ψϕ↔D+sD−s coupled-channel effect.

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