Measurement of masses of the $\Xi_c(2645)$ and $\Xi_c(2815)$ baryons and observation of $\Xi_c(2980)\to\Xi_c(2645)\pi$ %and observation of the $\Xi_c(2980)$ and observation of $\Xi_c(2980)\to \Xi_c(2645)\pi$

TL;DR

This paper presents precise measurements of the masses and mass splittings of certain Xi_c baryons and reports the observation of a new decay mode involving the Xi_c(2980) baryon, using data from the Belle experiment.

Contribution

The study provides the most precise mass measurements of the $ ext{Xi}_c(2645)$ and $ ext{Xi}_c(2815)$ baryons and reports the first observation of the decay $ ext{Xi}_c(2980) o ext{Xi}_c(2645)\pi$.

Findings

Mass splittings are measured with improved precision.

Observation of the decay $ ext{Xi}_c(2980) o ext{Xi}_c(2645)\pi$.

New decay mode of $ ext{Xi}_c(2980)$ observed.

Abstract

We report a precise measurement of the masses of the $\Xi_c(2645)$ and $\Xi_c(2815)$ baryons using a data sample of 414 fb$^{-1}$ collected by the Belle collaboration at the KEKB $e^+ e^-$ collider. The states $\Xi_c(2645)^{0,+}$ are observed in the $\Xi_c^{+,0}\pi^{-,+}$ decay modes, while the $\Xi_c(2815)^{0,+}$ are reconstructed in the $\Xi_c(2645)^{+,0}\pi^{-,+}$ decay modes. The following mass splittings are determined: $m_{\Xi_c(2645)^+} - m_{\Xi_c(2645)^0} = (-0.1 \pm 0.3 ({\rm stat}) \pm 0.6 {(\rm syst})) {\rm MeV}/{\rm c}^2$ and $m_{\Xi_c(2815)^+} - m_{\Xi_c(2815)^0} = (-3.4 \pm 1.9 ({\rm stat}) \pm 0.9 {(\rm syst})) {\rm MeV}/{\rm c}^2$ with a much better precision than the current world averages. We also observe a new decay mode, $\Xi_c(2980)^{0,+} \to \Xi_c(2645)^{+,0}\pi^{-,+}$.