Observation of a Resonant Structure near the ${D}_{s}^{+}{D}_{s}^{\ensuremath{-}}$ Threshold in the ${B}^{+}\ensuremath{\rightarrow}{D}_{s}^{+}{D}_{s}^{\ensuremath{-}}{K}^{+}$ Decay

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Observation of a Resonant Structure near the $D_{s}^{+} D_{s}^{-}$ Threshold in the $B^{+} \to D_{s}^{+} D_{s}^{-} K^{+}$ Decay

R. Aaij et al. (LHCb Collaboration)

Phys. Rev. Lett. 131, 071901 – Published 14 August 2023

Abstract

An amplitude analysis of the $B^{+} \to D_{s}^{+} D_{s}^{-} K^{+}$ 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 $3956 \pm 5 \pm 10 MeV$ , $43 \pm 13 \pm 8 MeV$ , and $J^{P C} = 0^{+ +}$ , 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 $c \bar{c} s \bar{s}$ 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 $J / ψ ϕ \leftrightarrow D_{s}^{+} D_{s}^{-}$ coupled-channel effect.

Received 28 October 2022
Revised 6 February 2023
Accepted 28 February 2023

DOI:https://doi.org/10.1103/PhysRevLett.131.071901

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Physics Subject Headings (PhySH)

Multiquark bound states Particle interactions Strong interaction

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First observation of the $B^{+} \to D_{s}^{+} D_{s}^{-} K^{+}$ decay

R. Aaij et al. (LHCb Collaboration)

Phys. Rev. D 108, 034012 (2023)

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Vol. 131, Iss. 7 — 18 August 2023

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Physical Review Letters

Observation of a Resonant Structure near the $D_{s}^{+} D_{s}^{-}$ Threshold in the $B^{+} \to D_{s}^{+} D_{s}^{-} K^{+}$ Decay

R. Aaij et al. (LHCb Collaboration)

Phys. Rev. Lett. 131, 071901 – Published 14 August 2023

Abstract

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First observation of the $B^{+} \to D_{s}^{+} D_{s}^{-} K^{+}$ decay

R. Aaij et al. (LHCb Collaboration)

Phys. Rev. D 108, 034012 (2023)

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Physical Review Letters

Observation of a Resonant Structure near the Ds+Ds− Threshold in the B+→Ds+Ds−K+ Decay

R. Aaij et al. (LHCb Collaboration)

Phys. Rev. Lett. 131, 071901 – Published 14 August 2023

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First observation of the B+→Ds+Ds−K+ decay

R. Aaij et al. (LHCb Collaboration)

Phys. Rev. D 108, 034012 (2023)

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Observation of a Resonant Structure near the $D_{s}^{+} D_{s}^{-}$ Threshold in the $B^{+} \to D_{s}^{+} D_{s}^{-} K^{+}$ Decay

First observation of the $B^{+} \to D_{s}^{+} D_{s}^{-} K^{+}$ decay