Observation of five new narrow $\hat{I}{\text{c◯}}_c^0$ states decaying to $\hat{I}{ž}_c^{+}{K}^{-}$

Abstract

The $\hat{I}{ž}_c^{+}{K}^{-}$ mass spectrum is studied with a sample of $pp$ collision data corresponding to an integrated luminosity of 3.3 fb${}^{-1}$, collected by the LHCb experiment. The $\hat{I}{ž}_c^{+}$ is reconstructed in the decay mode $p{K}^{-}\ddot{I}{€}^{+}$. Five new, narrow excited $\hat{I}{\text{c◯}}_c^0$ states are observed: the $\hat{I}{\text{c◯}}_c(3000{)}^0$, $\hat{I}{\text{c◯}}_c(3050{)}^0$, $\hat{I}{\text{c◯}}_c(3066{)}^0$, $\hat{I}{\text{c◯}}_c(3090{)}^0$, and $\hat{I}{\text{c◯}}_c(3119{)}^0$. Measurements of their masses and widths are reported.

14 pages, 3 figures. All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-002.html