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Article
Report number arXiv:2210.15153 ; CERN-EP-2022-200 ; LHCb-PAPER-2022-018
Title Observation of a resonant structure near the D+sDs threshold in the B+D+sDsK+ decay
Author(s) LHCb Collaboration  Prikaži svih 1065 autora
Corporate Author(s) LHCb Collaboration
Publication 2023-08-14
Imprint 27 Oct 2022
Number of pages 12
Note All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-018.html (LHCb public pages)
In: Phys. Rev. Lett. 131 (2023) 071901
DOI 10.1103/PhysRevLett.131.071901 (publication)
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; LHCb
Free keywords exotics ; B physics ; particle and resonance production ; LHCb
Abstract An amplitude analysis of the B+D+sDsK+ 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 centre-of-mass energies of 7, 8 and 13 TeV. A near-threshold peaking structure, referred to as X(3960), is observed in the D+sDs 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 cˉcsˉs quarks. Evidence for an additional structure is found around 4140 MeV in the D+sDs invariant mass, which might be caused either by a new resonance with the 0++ assignment or by a J/ψϕD+sDs coupled-channel effect.
Copyright/License Publication: © 2023-2024 CERN (License: CC BY 4.0), sponsored by SCOAP³
Preprint: © 2022-2024 CERN (License: CC-BY-4.0)



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 Zapis kreiran 2022-10-27, zadnja izmjena 2024-09-14


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