Strange baryons with two heavy quarks

TL;DR

This paper reports the observation of a doubly-charmed baryon by LHCb and uses theoretical methods to predict masses of various heavy baryons, including those not yet observed, with discussions on production and decay.

Contribution

The paper combines experimental observation with theoretical mass predictions for heavy baryons, extending predictions to unobserved states like $ ext{Ω}_{cc}^+$, Ω_{bc}, and Ω_{bb}.

Findings

Observation of $ ext{Ξ}_{cc}^{++}$ baryon at 3621.40 MeV.

Predicted masses for $ ext{Ω}_{cc}^+$ and $ ext{Ω}_{cc}^*$ baryons.

Predictions for $ ext{Ω}_{bc}$ and $ ext{Ω}_{bb}$ masses.

Abstract

The LHCb Experiment at CERN has observed a doubly-charmed baryon $\Xi_{cc}^{++} =ccu$ with a mass of $3621.40 \pm 0.78$ MeV, consistent with many predictions. We use the same methods that led us to predict $M(\Xi_{cc},~J^P{=}1/2^+) = 3627 \pm 12$ MeV and $M(\Xi_{cc}^*,~J^P{=}3/2^+) = 3690 \pm 12$ MeV to predict $M(\Omega_{cc}^+,J^P{=}1/2^+) = 3692 \pm 16$ MeV and $M(\Omega_{cc}^*,~J^P{=} 3/2^+) = 3756 \pm 16$ MeV. Production and decay are discussed briefly, and predictions for $M(\Omega_{bc})$ and $M(\Omega_{bb})$ are included.