Weak Radiative Decays of Anti-triplet Bottomed Baryons in Light-Front Quark Model

TL;DR

This paper investigates weak radiative decays of anti-triplet bottom baryons using the light-front quark model, providing predictions consistent with experimental data and exploring flavor symmetry breaking effects.

Contribution

It offers new theoretical predictions for bottom baryon radiative decay branching ratios and analyzes flavor symmetry breaking effects within the light-front quark model.

Findings

Predicted branching ratio for mbda_b mbda  6.6 1 10^{-6}

Predicted branching ratios for _b^0 ^0  1.0 1 10^{-5} and _b^- ^-  1.1 1 10^{-5}

Flavor symmetry breaking effects can be as large as 20%.

Abstract

We study the weak radiative decays of ${\bf B}_b \to {\bf B}_n \gamma$ with ${\bf B}_{b(n)} $ the anti-triplet-bottom (octet) baryons in the light front quark model. We obtain that ${\cal B}(\Lambda_b \to \Lambda \gamma)= (7.1 \pm 0.3 )\times 10 ^{-6}$, which agrees well with the current experimental value of $(7.1 \pm 1.7 )\times 10 ^{-6}$. We predict that ${\cal B}(\Xi_b^0 \to \Xi^0 \gamma)= (1.0 \pm 0.1 )\times 10 ^{-5}$ and ${\cal B}(\Xi_b^- \to \Xi^- \gamma) = (1.1 \pm 0.1) \times 10^{-5}$, which are consistent with the latest upper limits set by the LHCb collaboration. In addition, we find that the $SU(3)_F$ flavor symmetry breaking effects for the modes related to the $b\to d \gamma$ transition can be as large as $20\%$.