Weak Radiative Decay Lambda_b to Lambda gamma and Quark-Confined Effects in the Covariant Oscillator Quark Model

TL;DR

This paper analyzes the weak radiative decay Lambda_b to Lambda gamma using the covariant oscillator quark model, considering both short and long distance effects, and estimates its branching ratio.

Contribution

It introduces a systematic analysis of Lambda_b to Lambda gamma decay incorporating confined quark effects and long distance contributions via VMD in the covariant oscillator quark model.

Findings

Estimated branching ratio: 0.23 x 10^-5

Inclusion of both short and long distance effects

Use of vector meson dominance method

Abstract

Motivated by the observation of the decay B to K* gamma by the CLEO collaboration, we have systematically analyzed the weak radiative decay Lambda_b to Lambda gamma, evaluating the confined effects of quarks in the covariant oscillator quark model. This decay process receives both short distance (electromagnetic penguins at the one loop level) the long distance contributions in the quark level. The long distance contributions are analyzed using the vector meson dominance (VMD) method. The estimated branching ratio is found to be 0.23 times 10^-5.