2025/07/31 by Zafar, Sajawal, Salam, Qazi Maaz Us, Khan, Rana +2
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2507.23721
We investigate the cascade decay B*0s → Ds-(→ τ- ντ) ℓ+ ν_ℓ induced by flavor changing charged currents in the context of the Standard Model and in vector-like couplings beyond the Standard Model. We employ the helicity amplitude formalism for analysis and highlight the role of new vector-like couplings in charged current interactions. We find, in particular, that while new left handed chiral-vector like interactions contribute to the branching ratio, they do not affect the forward-backward asymmetry, or the angular observables. On the other hand, the right handed chiral vector-like coupling in the case of this decay contributes to the branching ratio, forward-backward asymmetry and the angular observables. We confirm that this difference in behavior between the left and right handed NP couplings is a general feature of charged current processes with a vector meson going to a pseudoscalar at the tree level in effective weak theory by cross checking with the cascade decays B*+c → P(→ P' μ+ νμ) ℓ+ ν_ℓ where P is Bs0 (D0) and P' is Ds*- (K-).