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Solving the flavour problem with hierarchical fermion wave functions

Abstract : We investigate the flavour structure of generic extensions of the SM where quark and lepton mass hierarchies and the suppression of flavour-changing transitions originate only by the normalization constants of the fermion kinetic terms. We show that in such scenarios the contributions to quark FCNC transitions from dimension-six effective operators are sufficiently suppressed without (or with modest) fine tuning in the effective scale of new physics. The most serious challenge to this type of scenarios appears in the lepton sector, thanks to the stringent bounds on LFV. The phenomenological consequences of this scenarios in view of improved experimental data on quark and lepton FCNC transitions, and its differences with respect to the Minimal Flavour Violation hypothesis are also discussed.
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http://hal.in2p3.fr/in2p3-00189774
Contributor : Dominique Girod <>
Submitted on : Thursday, November 22, 2007 - 10:13:08 AM
Last modification on : Thursday, June 17, 2021 - 3:18:51 PM

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Sacha Davidson, G. Isidori, S. Uhlig. Solving the flavour problem with hierarchical fermion wave functions. Physics Letters B, Elsevier, 2008, 663, pp.73-79. ⟨10.1016/j.physletb.2008.04.005⟩. ⟨in2p3-00189774⟩

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