@Article{LHCbCollaborationAaij_etal2023,
author="LHCb Collaboration (Aaij, R. et al
and Jaimes Elles, S. J.
and Jashal, B. K.
and Martinez-Vidal, F.
and Oyanguren, A.
and Rebollo De Miguel, M.
and Remon Alepuz, C.
and Ruiz Vidal, J.
and Sanderswood, I.",
title="Observation of a Resonant Structure near the Ds+Ds- Threshold in the B+ -> Ds+Ds- K+ Decay",
journal="Physical Review Letters",
year="2023",
publisher="Amer Physical Soc",
volume="131",
number="7",
pages="071901--12pp",
abstract="An amplitude analysis of the B thorn {\&} RARR; D thorn s D-s K thorn 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 thorn 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 1 5 1 10 MeV, 43 1 13 1 8 MeV, and JPC = 0 thorn thorn , 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 cc over bar ss over bar quarks. Evidence for an additional structure is found around 4140 MeV in the D thorn s D-s invariant mass, which might be caused either by a new resonance with the 0 thorn thorn assignment or by a J={\&} psi;{\&} phi; {\&} LRARR; D thorn s D-s coupled-channel effect.",
optnote="WOS:001066381600001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=5733), last updated on Wed, 10 Apr 2024 12:44:31 +0000",
issn="0031-9007",
doi="10.1103/PhysRevLett.131.071901",
opturl="https://arxiv.org/abs/2210.15153",
opturl="https://doi.org/10.1103/PhysRevLett.131.071901",
language="English"
}