Abstract:
We study B ! D and B ! D flavour changing charged current decay processes.
These processes are interesting due to having persistent anomalies, RD and RD ,
first reported by Belle in 2007 and later by the different experiment like LHCb, Belle
and BABAR. These anomalies hint physics beyond-the-Standard Model that is commonly
named as new physics. For theoretical framework to study these transitions,
for all possible dimension-six operators including new physics in model independent
way, we write a low-energy effective Hamiltonian. We used the Wilson coefficients that
are obtained from a numerical fit to all existing data to predict our observables. For
numerical predictions we used HQET form factors for both transitions. We focus on
B ! D decay that provides interesting angular observables due to cascade decay
of D ! D . Within and beyond the standard model our findings match with the
known results in model independent way for angular observables.
