Observation of new resonances decaying to $J/\psi K^{+}$ and $J/\psi \varphi$

Abstract

The first observation of exotic states with a new quark content $c\bar{c}u\bar{s}$ decaying to the $J/\psi K^{+}$ final state is reported with high significance from an amplitude analysis of the $B^{+}\to J/\psi \varphi K^{+}$ decay. The analysis is carried out using proton-proton collision data corresponding to a total integrated luminosity of 9 fb${}^{-1}$ collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV. The most significant state, $Z_{cs}(4000{)}^{+}$, has a mass of $4003\pm 6{}_{-14}^{+4}$ MeV, a width of $131\pm 15\pm 26$ MeV, and spin-parity $J^P=1^{+}$, where the quoted uncertainties are statistical and systematic, respectively. A new $1^{+}$ $X(4685)$ state decaying to the $J/\psi \varphi$ final state is also observed with high significance. In addition, the four previously reported $J/\psi \varphi$ states are confirmed and two more exotic states, $Z_{cs}(4220{)}^{+}$ and $X(4630)$, are observed with significance exceeding five standard deviations.

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-044.html (LHCb public pages)

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• Evidence for a Narrow Near-Threshold Structure in the $J/\psi \varphi$ Mass Spectrum in $B^{+}\to J/\psi \varphi K^{+}$ Decays
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