Observation of a new charmed strange meson

Abstract

Using the CLEO II detector, we have obtained evidence for a new meson decaying to ${\mathit{D}}^{0}$${\mathit{K}}^{+}$. Its mass is 2573.${2}_{\mathrm{\ensuremath{-}}1.6}^{+1.7}$\ifmmode\pm\else\textpm\fi{}0.8\ifmmode\pm\else\textpm\fi{}0.5 MeV/${\mathit{c}}^{2}$ and its width is ${16}_{\mathrm{\ensuremath{-}}4}^{+5}$\ifmmode\pm\else\textpm\fi{}3 MeV/${\mathit{c}}^{2}$. Although we do not establish its spin and parity, the new meson is consistent with predictions for an L=1, S=1, ${\mathit{J}}^{\mathit{P}}$=${2}^{+}$ charmed strange state.