Edinburgh Research Explorer

Model-independent observation of exotic contributions to $B^0\to J/\psi K^+\pi^-$ decays

Research output: Contribution to journalArticle

Original languageEnglish
Article numberAaij:2019ipm
Pages (from-to)152002
JournalPhysical Review Letters
Issue number15
Publication statusPublished - 18 Apr 2019


An angular analysis of $B^0\to J/\psi K^+\pi^-$ decays is performed, using proton-proton collision data corresponding to an integrated luminosity of 3~${\rm fb}^{-1}$ collected with the LHCb detector. The $m(K^+\pi^-)$ spectrum is divided into fine bins. In each $m(K^+\pi^-)$ bin, the hypothesis that the three-dimensional angular distribution can be described by structures induced only by $K^\ast$ resonances is examined, making minimal assumptions about the $K^+\pi^-$ system. The data reject the $K^\ast$-only hypothesis with a large significance, implying the observation of exotic contributions in a model-independent fashion. Inspection of the $m(J/\psi\pi^-)$ versus $m(K^+\pi^-)$ plane suggests structures near $m(J/\psi\pi^-)=4200$~MeV and 4600~MeV.

ID: 90519693