Revealing New Physics in $B^0_s\to D_s^\mp K^\pm$ Decays

Abstract

The B 0 s → D ∓ s K ± system allows a determination of the Unitarity Triangle angle γ. Intrigued by an LHCb analysis showing a surprisingly large result in tension with other γ measurements, we point out that also the rates of the individual B 0 s → D ∓ s K ± channels show puzzling patterns, in accordance with similar decays. We present a formalism to include New-Physics effects and apply it to the data. Interestingly, new contributions of moderate size could accommodate the data. Utilising this formalism in the high-precision B physics era may establish new sources of CP violation.

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CP violation in non-leptonic B decays as a portal to New Physics

“…The framework for the interpretation of these quantities is provided by factorisation, which is well supported through the measured δ s . In order to minimise the impact of hadronic form factor uncertainties, it is useful to introduce ratios with respect to semileptonic B decays [21,22]:…”