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General minimal flavor violation

General minimal flavor violation,10.1103/PhysRevD.80.076002,Physical Review D,Alexander L. Kagan,Gilad Perez,Tomer Volansky,Jure Zupan

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General minimal flavor violation   (Citations: 22)
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A model independent study of the minimal flavor violation (MFV) framework is presented, where the only sources of flavor breaking at low energy are the up and down Yukawa matrices. Two limits are identified for the Yukawa coupling expansion: linear MFV, where it is truncated at the leading terms, and nonlinear MFV, where such a truncation is not possible due to large third generation Yukawa couplings. These are then resummed to all orders using nonlinear sigma-model techniques familiar from models of collective breaking. Generically, flavor-diagonal CP violating (CPV) sources in the UV can induce O(1) CPV in processes involving third generation quarks. Because of a residual U(2) symmetry, the extra CPV in Bd-B¯d mixing is bounded by CPV in Bs-B¯s mixing. If operators with right-handed light quarks are subdominant, the extra CPV is equal in the two systems, and is negligible in processes involving only the first two generations. We find large enhancements in the up-type sector, both in CPV in D-D¯ mixing and in top flavor violation.
Journal: Physical Review D - PHYS REV D , vol. 80, no. 7, 2009
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    • ...1 This is modied, though, in some MFV versions such as two-Higgs doublet models [ 1] with extra discrete symmetries [4], or in models with strong dynamics [5]...

    R. Alonso, et al. On the scalar potential of minimal flavour violation

    • ...For example, in the case of ‘linear MFV’, one imagines that each Yukawa insertion comes with a small coefficient, so that only the leading terms are important, whereas in ‘general MFV’ all Yukawa insertions are considered to be of similar size [28]...

    Brian Batell, et al. Dark matter from minimal flavor violation

    • ...b , whose importance has been stressed in [19, 37], is implicitly taken into account by a redenition of the...
    • ...The so-called General MFV, proposed in [19], is based on the same symmetry and symmetry-breaking pattern proposed in [5], but for the decoupling of CP and avour symmetries...
    • ...In ref. [19] particular emphasis is put on the fact that the expansion in powers of the top and bottom Yukawa couplings should not be truncated...
    • ...In particular, as noted in [19], a large new phase in B 0 { B 0 mixing...

    Andrzej J. Buras, et al. Higgs-mediated FCNCs: natural flavour conservation vs. minimal flavour...

    • ...4 It has been proven in [27] that new CP violating eects can be larger in Bs than in Bd in nonlinear...
    • ...MFV can be formulated up to linear order in top Yukawa insertions, or extended to a nonlinear representation of the symmetry [26, 27]...

    Michael Trott, et al. On theories of enhanced CP violation in B s,d meson mixing

    • ...In particular, it implies that the new physics contributions are the same in the Bd and Bs systems [9]...
    • ...We find that three of these — the two where there is a large effect on S K simultaneously with a negligible effect on S � (with large or small effect on ǫK) [9] and the one with large effects in all three systems cannot be realized in our framework...

    Kfir Blum, et al. Implications of large dimuon CP asymmetry in B d , s decays on minimal...

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