Origin of anomalous branching ratios in colour-allowed tree decays

Determine whether the unexpectedly low branching ratios of B_s^0\to D_s^\mp K^\pm and related colour-allowed tree decays originate from QCD effects or New Physics, and establish how their explanation is connected with CP-violation and gamma determinations.

Background

The paper discusses discrepancies between measured and predicted factorisation parameters and branching ratios for B_s0\to D_s\mp K\pm and similar colour-allowed tree decays. Possible explanations include QCD effects or New-Physics contributions to B_s0--\bar B_s0 mixing or to the decay amplitudes. The relationship between these branching-ratio anomalies and theoretically clean CP-violation and gamma measurements is explicitly left unresolved.

References

Concerning the puzzling patterns in the branching ratios of B0_s\to D_s\mp K\pm and similar modes, the question is whether they originate from effects of QCD or NP. How will the interplay with CP violation studies and \gamma determinations, which are theoretically clean, evolve in the future?

— Theoretical Perspectives on Flavour Physics  (2609.29314 - Fleischer, 24 Sep 2026) in Section 4, Non-Leptonic B Decays Originating from Tree Topologies