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24 April 2024 |
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Fermion Hierarchy from Sfermion Anarchy | | Wolfgang Altmannshofer
; Claudia Frugiuele
; Roni Harnik
; | | Date: |
8 Sep 2014 | | Abstract: | We present a framework to generate the hierarchical flavor structure of
Standard Model quarks and leptons from loops of superpartners. The simplest
model consists of the minimal supersymmetric standard model with tree level
Yukawa couplings for the third generation only and anarchic squark and slepton
mass matrices. Agreement with constraints from low energy flavor observables,
in particular Kaon mixing, is obtained for supersymmetric particles with masses
at the PeV scale or above. In our framework both the second and the first
generation fermion masses are generated at 1-loop. Despite this, a novel
mechanism generates a hierarchy among the first and second generations without
imposing a symmetry or small parameters. A second-to-first generation mass
ratio of order 100 is typical. The minimal supersymmetric standard model thus
includes all the necessary ingredients to realize a fermion spectrum that is
qualitatively similar to observation, with hierarchical masses and mixing. The
minimal framework produces only a few quantitative discrepancies with
observation, most notably the muon mass is too low. We discuss simple
modifications which resolve this and also investigate the compatibility of our
model with gauge and Yukawa coupling Unification. | | Source: | arXiv, 1409.2522 | | Services: | Forum | Review | PDF | Favorites | |
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