Fragmentation fraction $f_{\Omega_b}$ and the $\Omega_b\to \Omega J/\psi$ decay in the light-front formalism

TL;DR

This paper predicts the branching ratio of the decay $ ext{Omega}_b o ext{Omega} J/ ext{Psi}$ and estimates the fragmentation fraction $f_{ ext{Omega}_b}$ using a light-front quark model, aiding future experimental comparisons.

Contribution

The study provides the first theoretical estimate of the fragmentation fraction $f_{ ext{Omega}_b}$ and decay branching ratio using light-front formalism.

Findings

Predicted ${ m BR}( ext{Omega}_b o ext{Omega} J/ ext{Psi})$ as approximately $5.3 imes 10^{-4}$.

Estimated $f_{ ext{Omega}_b}$ to be about $0.54 imes 10^{-2}$.

Demonstrated that $b$ to $ ext{Omega}_b$ production is more suppressed than $b$ to $ ext{Lambda}_b$ or $ ext{Xi}_b$.

Abstract

One has measured $f_{\Omega_b}{\cal B}(\Omega_b^-\to \Omega^- J/\Psi)$ at the level of $10^{-6}$, where the fragmentation faction $f_{\Omega_b}$ is to evaluate the $b$-quark to $\Omega_b^-$ production rate. Using the $\Omega_b\to \Omega$ transition form factors calculated in the light-front quark model, we predict ${\cal B}(\Omega_b^-\to \Omega^- J/\Psi) =(5.3^{+3.3+3.8}_{-2.1-2.7})\times 10^{-4}$. In particular, we extract $f_{\Omega_b}=(0.54^{+0.34+0.39+0.21}_{-0.22-0.28-0.15})\times 10^{-2}$, demonstrating that the $b$ to $\Omega_b$ productions are much more difficult than the $b$ to $\Lambda_b(\Xi_b)$ ones. Since $f_{\Omega_b}$ has not been determined experimentally, $f_{\Omega_b}$ added to theoretical branching fractions can be compared to future measurements of the $\Omega_b$ decays.