Evidence of New States Decaying into $\Xi_{c}^{*}\pi$

TL;DR

This paper reports the discovery of two new charmed baryons decaying into $\Xi_c^{*}\pi$ states, with measured mass differences, interpreted as $J^P=3/2^-$ $\Xi_{c1}$ particles, expanding understanding of charmed-strange baryon states.

Contribution

First evidence of new $\Xi_{c1}$ states decaying into $\Xi_c^{*}\pi$, with measured mass differences and quantum number assignments, advancing knowledge of charmed baryon spectroscopy.

Findings

Measured mass differences of approximately 348 MeV and 347 MeV.

Identified the states as $J^P=3/2^-$ $\Xi_{c1}$ particles.

Provided evidence for new charmed baryon states.

Abstract

Using data recorded by the CLEO II detector at CESR, we report evidence for two new charmed baryons, one decaying into $\Xi_c^+\pi^+\pi^-$ via an intermediate $\Xi_c^{*0}$, and its isospin partner decaying into $\Xi_c^0\pi^+\pi^-$ via an intermediate $\Xi_c^{*+}$. We measure the mass differences of the two states to be $M(\Xi_c^+\pi^+\pi^-)-M(\Xi_c^+)=$ $348.6\pm0.6\pm1.0$ MeV, and $M(\Xi_c^0\pi^+\pi^-)-M(\Xi_c^0)=$ $347.2\pm0.7\pm2.0$ MeV. We interpret these new states as the $J^P = {3 \over{2}}^- $ $\Xi_{c1}$ particles, the charmed-strange analogues of the $\Lambda_{c1}^+(2625)$.