Weak decays of doubly heavy baryons: the FCNC processes

TL;DR

This paper analyzes flavor-changing neutral current decays of doubly heavy baryons using a light-front approach, predicting decay rates and asymmetries to test the Standard Model and explore new physics.

Contribution

It introduces a detailed study of FCNC processes in doubly heavy baryons with form factors calculated via light-front approach, including symmetry effects and uncertainties.

Findings

Branching ratios for $b o s$ are $10^{-8}$ to $10^{-7}$.

Branching ratios for $b o d$ are $10^{-9}$ to $10^{-8}$.

Predicted decay observables can aid in testing the Standard Model.

Abstract

The discovery of doubly heavy baryon provides us with a new platform for precisely testing Standard Model and searching for new physics. As a continuation of our previous works, we investigate the FCNC processes of doubly heavy baryons. Light-front approach is adopted to extract the form factors, in which the two spectator quarks are viewed as a diquark. Results for form factors are then used to predict some phenomenological observables, such as the decay width and the forward-backward asymmetry. We find that most of the branching ratios for $b\to s$ processes are $10^{-8}\sim10^{-7}$ and those for $b\to d$ processes are $10^{-9}\sim10^{-8}$. The flavor SU(3) symmetry and symmetry breaking effects are explored. Parametric uncertainties are also investigated.