Fragmentation fractions of two-body b-baryon decays

TL;DR

This paper estimates b-baryon fragmentation fractions and decay branching ratios based on existing measurements, providing predictions to test theoretical models like QCD factorization.

Contribution

It introduces new estimates of b-baryon fragmentation fractions and decay branching ratios derived from experimental data, aiding validation of theoretical decay models.

Findings

Estimated $f_{\Lambda_b}$ as 0.175±0.106

Derived branching ratios for $\Lambda_b$ and $\Xi_b^-$ decays

Predicted branching ratios enable testing of QCD factorization models

Abstract

We study the fragmentation fractions $(f_{{\bf B}_b})$ of the $b$-quark to b-baryons (${\bf B}_b$). By the assumption of $f_{\Lambda_b}/(f_u+f_d)=0.25\pm 0.15$ in accordance with the measurements by LEP, CDF and LHCb Collaborations, we estimate that $f_{\Lambda_b}=0.175\pm 0.106$ and $f_{\Xi_b^{-,0}}=0.019\pm 0.013$. From these fragmentation fractions, we derive ${\cal B}(\Lambda_b\to J/\psi \Lambda)=(3.3\pm 2.1)\times 10^{-4}$, ${\cal B}(\Xi_b^-\to J/\psi \Xi^-)=(5.3\pm 3.9)\times 10^{-4}$ and ${\cal B}(\Omega_b^-\to J/\psi \Omega^-)>1.9\times 10^{-5}$. The predictions of ${\cal B}(\Lambda_b\to J/\psi \Lambda)$ and ${\cal B}(\Xi_b^-\to J/\psi \Xi^-)$ clearly enable us to test the theoretical models, such as the QCD factorization approach in the $b$-baryon decays.