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Revealing New Physics in $B^0_s\to D_s^\mp K^\pm$ Decays
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abstract
The $B^0_s\to D_s^\mp K^\pm$ system offers a determination of the Unitarity Triangle angle $\gamma$. Intrigued by an LHCb analysis showing a surprisingly large result in tension with information on the Unitarity Triangle and other $\gamma$ measurements, we make a transparent study of the measured observables, confirming the LHCb picture. The corresponding $\gamma$ puzzle at the $3\sigma$ level would require CP-violating contributions of New Physics, which should also manifest themselves in the corresponding decay branching ratios. Indeed, we find that the rates of the individual $B^0_s\to D_s^\mp K^\pm$ channels show puzzling patterns, in accordance with similar decays, with tensions up to $4.8\sigma$, thereby making the situation much more exciting. We present a formalism to include New-Physics effects in a model-independent way and apply it to the data to constrain the corresponding parameters. Interestingly, new contributions of moderate size could accommodate the data. Utilising this formalism in the future high-precision $B$ physics era may allow us to finally establish new sources of CP violation.
Forward citations
Cited by 4 Pith papers
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$b\to c \bar u q$ decay and CP violating observables in the presence of new physics contributions
Phenomenological constraints on complex Wilson coefficients for b→cūq transitions from branching fraction tensions, yielding predictions for ΔΓd/Γd, ASL^d and ACP under color-singlet and color-rearranged scenarios.
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