Observation of a resonant structure near the $D_s^{+}{D}_s^{-}$ threshold in the $B^{+}\to D_s^{+}{D}_s^{-}{K}^{+}$ decay

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 centre-of-mass energies of 7, 8 and 13 TeV. A near-threshold peaking structure, referred to as $X(3960)$, is observed in the $D_s^{+}{D}_s^{-}$ 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 $J^{PC}=0^{++}$, 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 $J/\psi \varphi \leftrightarrow D_s^{+}{D}_s^{-}$ coupled-channel effect.

arXiv commentAll 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)

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Cited by in corpus (19)

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• Scalar and tensor charmonium resonances in coupled-channel scattering from QCD
• Molecular charmed baryons and pentaquarks from light-meson exchange saturation
• Hidden-flavour four-quark states in the charm and bottom region
• Relativistic description of asymmetric fully heavy tetraquarks in the diquark-antidiquark model
• Charmonium ${\chi }_{c0}$ and ${\chi }_{c2}$ resonances in coupled-channel scattering from lattice QCD
• $P$-wave charmonium contribution to hidden-charm states from reanalysis of lattice QCD data
• Tetraquark Masses by using extension of Gursey-Radicati Mass Formula
• First observation of the $B^{+}\to D_s^{+}{D}_s^{-}{K}^{+}$ decay
• Doubly charmed hexaquarks in the diquark picture
• $X(3960)$, $X_0(4140)$, and other compact $cs\bar{c}\bar{s}$ states
• Classification of Coupled-Channel Near-Threshold Structures
• Study of the $B^{-}\to K^{-}\eta {\eta }_c$ decay due to the $D\bar{D}$ bound state
• Doubly-charmed pentaquark states in a mass splitting model
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• Exotic hadrons associated with $b$-quark
• Systematic exploration of triply heavy tetraquarks: spectroscopic and decay characteristics