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Title: Observation of a Resonant Structure near the D s + D s - Threshold in the B + D s + D s - K + Decay

Journal Article · · Physical Review Letters
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An amplitude analysis of the B+ → $$D^{+}_{s}$$ $$D^{-}_{s}$$ ⁢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 $$D^{+}_{s}$$ $$D^{-}_{s}$$ 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 JP⁢C = 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$$\overline{c}$$s$$\overline{s}$$ quarks. Evidence for an additional structure is found around 4140 MeV in the $$D^{+}_{s}$$ $$D^{-}_{s}$$ invariant mass, which might be caused either by a new resonance with the 0++ assignment or by a J/ψ⁢Φ ↔ $$D^{+}_{s}$$ $$D^{-}_{s}$$ coupled-channel effect.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE
Contributing Organization:
LHCb Collaboration
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2423034
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 131; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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