Implications for new physics from a novel puzzle in $\bar{B}_{(s)}^0 \to D^{(\ast)+}_{(s)} \lbrace π^-, K^- \rbrace$ decays

Abstract

Recently, the standard model predictions for the B-meson hadronic decays, B 0 → D ( * )+ K − and B 0 s → D ( * )+ s π − , have been updated based on the QCD factorization approach. This improvement sheds light on a novel puzzle in the B-meson hadronic decays: there are mild but universal tensions between data and the predicted branching ratios. Assuming the higher-order QCD corrections are not huge enough to solve the tension, we examine several new physics interpretations of this puzzle. We find that the tension can be partially explained by a left-handed W model which can be compatible with other flavor observables and collider bounds.

New physics contributions to $\bar{B}^0_{(s)}\to D^{(*)}_{(s)}\,K/\pi$

“…We consider an extended electroweak gauge group SU(2) 1 ×SU(2) 2 ×U(1) Y with heavy vectorlike fermions produces heavy gauge bosons, W ± and Z , interacting with the left-handed SM fermions with a non-trivial flavor structure [9,16]. These flavor structures are controlled by the number of generations of the vector-like fermions and mixings between the SM fermions and vector-like fermions.…”

“…The above situation could be resolved by introducing new physics contributions to b → c ūq transitions, where q = d and s. In this work several new physics scenarios to explain this b → c ūq anomaly is investigated [9].…”

Taming new physics in b → cūd(s) with τ(B+)/τ(Bd) and $$ {a}_{sl}^d $$

“…Explicit BSM explanations of these deviations have been studied in ref. [58] for the case of new physics acting in Q 1 and Q 2 .…”

Testing the Standard Model with CP-asymmetries in flavour-specific non-leptonic decays

“…More recently such effects have also been investigated for the case of the decay Bs → D + s K − [48,49]. BSM explanations have been considered in [3,50] and challenged by collider bounds in [51].…”