Fragmentation fraction fΩb and the Ωb→ΩJ/ψ decay in the light-front formalism

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.