Weak decays of doubly heavy baryons: The FCNC processes

The discovery of doubly heavy baryon provides us with a new platform for precisely testing the standard model and searching for new physics. As a continuation of our previous works, we investigate the flavor-changing neutral current processes of doubly heavy baryons. The 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→s processes are 10−8–10−7 and those for b→d processes are 10−9–10−8. The flavor SU(3) symmetry and symmetry breaking effects are explored. Parametric uncertainties are also investigated.