The LHCb collaboration has recently reported the first observation of CP violation in the penguin-dominated Bs0\documentclass[12pt]{minimal}
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\begin{document}$$ {B}_s^0 $$\end{document}→ K−K+ decay and further new measurements, indicating differences between the direct CP asymmetries of both the Bs0\documentclass[12pt]{minimal}
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\begin{document}$$ {B}_s^0 $$\end{document}→ K−K+, Bd0\documentclass[12pt]{minimal}
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\begin{document}$$ {B}_d^0 $$\end{document}→ π−K+ and the Bd0\documentclass[12pt]{minimal}
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\begin{document}$$ {B}_d^0 $$\end{document}→ π−π+, Bs0\documentclass[12pt]{minimal}
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\begin{document}$$ {B}_s^0 $$\end{document}→ K−π+ modes. We show that these puzzling differences can be accommodated through sizeable penguin annihilation and exchange topologies in the Standard Model, and constrain them. Utilising the U-spin symmetry, we extract the angle γ of the unitarity triangle from the CP asymmetries in the Bs0\documentclass[12pt]{minimal}
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\begin{document}$$ {B}_s^0 $$\end{document}→ K−K+, Bd0\documentclass[12pt]{minimal}
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\begin{document}$$ {B}_d^0 $$\end{document}→ π−π+ system alone, finding γ=65−7+11°\documentclass[12pt]{minimal}
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\begin{document}$$ \gamma =\left({65}_{-7}^{+11}\right){}^{\circ} $$\end{document}, in perfect agreement with the determination from tree-level B → DK decays. The Bs0−B¯s0\documentclass[12pt]{minimal}
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\begin{document}$$ {B}_s^0-{\overline{B}}_s^0 $$\end{document} mixing phase ϕs can be extracted from CP violation measurements in Bs0\documentclass[12pt]{minimal}
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\begin{document}$$ {B}_s^0 $$\end{document}→ K−K+ in a clean way. We present a new strategy and extract ϕs = −(3.6 ± 5.4)°. This result is in agreement with the determination from Bs0\documentclass[12pt]{minimal}
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\begin{document}$$ {B}_s^0 $$\end{document}→ J/ψϕ decays. New CP-violating contributions would influence these determinations differently. Hence it is interesting to keep monitoring both as the experimental picture sharpens.
