General minimal flavor violation

Alexander L. Kagan, Gilad Perez, Tomer Volansky, Jure Zupan

Research output: Contribution to journalArticlepeer-review

Abstract

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 σ-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-B̄d mixing is bounded by CPV in Bs-B̄s 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-D̄ mixing and in top flavor violation.

Original languageEnglish
Article number076002
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume80
Issue number7
DOIs
StatePublished - 13 Oct 2009
Externally publishedYes

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