Effects of family non-universal Z ′ model in angular observables of decays*

We present the angular distribution of the four-fold and decays in the Standard Model and family non-universal model. At the quark level, these decays are governed by the transition. Along with different angular observables, we provide predictions of differential branching ratios, forward-backward asymmetry, and longitudinal polarization fractions of and mesons. Our analysis shows that the signatures of the family non-universal model are more distinct in the observables associated with the decay than in those associated with the decay. Future measurements of the predicted angular observables, both at current and future high energy colliders, will provide useful complementary data required to clarify the structure of the family non-universal model in = processes.