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Implications of large dimuon CP asymmetry in B d,s decays on minimal flavor violation with low tan β

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Abstract

The D0 collaboration has recently announced evidence for a dimuon CP asymmetry in B d,s decays of order one percent. If confirmed, this asymmetry requires new physics. We argue that for minimally flavor violating (MFV) new physics, and at low tan β = v u /v d , there are only two four-quark operators (Q 2,3) that can provide the required CP violating effect. The scale of such new physics must lie below 260 GeV \( \sqrt {{\tan \beta }} \). The effect is universal in the B s and B d systems, leading to S ψ K ∼ sin 2β − 0.15 and S ψϕ ∼ 0.25. The effects on ϵ K and on electric dipole moments are negligible. The most plausible mechanism is tree-level scalar exchange. MFV supersymmetry with low tan β will be excluded. Finally, we explain how a pattern of deviations from the Standard Model predictions for S ψϕ , S ψ K and ϵ K can be used to test MFV and, if MFV holds, to probe its structure in detail.

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  1. Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, 76100, Israel

    Kfir Blum

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  1. Kfir Blum
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  2. Yonit Hochberg
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  3. Yosef Nir
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Correspondence to Kfir Blum.

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ArXiv ePrint: 1007.1872

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Blum, K., Hochberg, Y. & Nir, Y. Implications of large dimuon CP asymmetry in B d,s decays on minimal flavor violation with low tan β . J. High Energ. Phys. 2010, 35 (2010). https://doi.org/10.1007/JHEP09(2010)035

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