Observation of the Omega_c Charmed Baryon at CLEO

TL;DR

This paper reports the first observation of the Omega_c charmed baryon at CLEO, measuring its mass, production cross section times branching ratio, and analyzing multiple decay modes in e+e- collisions.

Contribution

The study provides the first experimental evidence of the Omega_c baryon, including its mass and production rates, using data from the CLEO detector at CESR.

Findings

Omega_c mass measured at 2694.6 MeV

Observed 40.4 ± 9.0 events for Omega_c

Measured cross section times branching ratio for various decay modes

Abstract

The CLEO detector at the CESR collider has used 13.7 fb^{-1} to search for the production of Omega_c (css-ground state) in e^{+}e^{-} collisions at sqrt{s} = 10.6 GeV The modes used to study the Omega_c are Omega- pi+, Omega- pi+ pi0, Xi- K- pi+ pi+, Xi0 K- pi+, and Omega- pi+ pi+ pi-. We observe 40.4 +- 9.0(stat) combined events at a mass of 2694.6 +- 2.6(stat) +- 2.4(syst) MeV. We have also measured the \sigma * Br of the above modes for xp > 0.5 to be 11.3 +- 3.9 +- 2.3 fb, 47.6 +- 18.0 +- 2.8 fb, 45.1 +- 23.2 +- 4.1 fb, 18.2 +- 10.6 +- 3.8 fb, and <5.1 fb @ 90 % CL, respectively.