Abstract
We propose a new framework for the observed flavor hierarchy and mixing based on left-right supersymmetry. The model contains the most minimal Higgs sector consisting only of gauge doublets which forbid the standard model Yukawa couplings. New mediator fields then connect the left- and right-chiral fermion sectors and result in effective tree level Yukawa couplings for the third generation charged fermions. The remaining fermions, including all neutrinos, acquire effective Yukawa couplings sourced by the supersymmetry breaking sector at loop level. We predict new TeV range scalars, as well as heavier fermions and vector bosons, that can be discovered at the LHC and future colliders.
Highlights
Despite the phenomenological success of the standard model (SM), the mass and mixing hierarchies in the quark and lepton sectors lack a proper understanding
We propose a new framework for the observed flavor hierarchy and mixing based on left-right supersymmetry
In the previous section we have shown that the mediated left-right supersymmetric model (MLRSM) effectively prevents two of the three SM quark—and charged lepton—generations from interacting with the Higgs bosons at the tree level
Summary
Despite the phenomenological success of the standard model (SM), the mass and mixing hierarchies in the quark and lepton sectors lack a proper understanding. An open question in this line of model building concerns the gauge structure of the Higgs sector, which usually relies on the bidoublet representation [4,5,6,7,8,18,19,20] rather than on doublet [21,22] scalar representations The former choice dominates the literature, the latter possibility has gained renewed interest [17] within frameworks for the radiative generation of the fermion mass hierarchy, as it automatically forbids the presence of all tree-level SM Yukawa couplings.
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