Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solving the flavour problem with hierarchical fermion wave functions   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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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas