Type: Article
Publication Date: 2020-12-07
Citations: 145
DOI: https://doi.org/10.1103/physrevlett.125.242001
The only anticipated resonant contributions to ${B}^{+}\ensuremath{\rightarrow}{D}^{+}{D}^{\ensuremath{-}}{K}^{+}$ decays are charmonium states in the ${D}^{+}{D}^{\ensuremath{-}}$ channel. A model-independent analysis, using LHCb proton-proton collision data taken at center-of-mass energies of $\sqrt{s}=7$, 8, and 13 TeV, corresponding to a total integrated luminosity of $9\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, is carried out to test this hypothesis. The description of the data assuming that resonances only manifest in decays to the ${D}^{+}{D}^{\ensuremath{-}}$ pair is shown to be incomplete. This constitutes evidence for a new contribution to the decay, potentially one or more new charm-strange resonances in the ${D}^{\ensuremath{-}}{K}^{+}$ channel with masses around $2.9\text{ }\text{ }\mathrm{GeV}/{c}^{2}$.