Observation of new $\Omega_c^{0}$ states decaying to the $\Xi_c^+K^-$ final state

TL;DR

This paper reports the discovery of two new excited $\Omega_c^0$ states in the $\Xi_c^+K^-$ decay channel, confirming five known states and measuring their properties with unprecedented precision using LHCb data.

Contribution

First observation of two new $\Omega_c^0$ states decaying to $\Xi_c^+K^-$, with precise measurements of all seven states' masses and widths.

Findings

Discovery of $\Omega_c(3185)^0$ and $\Omega_c(3327)^0$ states.

Confirmation of five previously observed $\Omega_c^0$ states.

Highest precision measurements of masses and widths of these states.

Abstract

Two new excited states, $\Omega_c(3185)^0$ and $\Omega_c(3327)^0$, are observed in the $\Xi_c^{+}K^{-}$ invariant-mass spectrum using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9\,{\rm fb}^{-1}$. Five previously observed excited $\Omega_c^0$ states are confirmed, namely $\Omega_c(3000)^0$, $\Omega_c(3050)^0$, $\Omega_c(3065)^0$, $\Omega_c(3090)^0$, and $\Omega_c(3119)^0$. The masses and widths of these seven states are measured with the highest precision to date.