F-term Induced Flavor Mass Spectrum

TL;DR

This paper introduces a new supersymmetry breaking mechanism using F-components of gauge-singlet superfields to naturally generate realistic flavor mass spectra and suppress flavor-changing neutral processes.

Contribution

It proposes a novel F-term based mechanism within an O'Raifeartaigh model to produce realistic fermion and sfermion mass hierarchies while maintaining flavor safety.

Findings

Reproduces the charged-lepton mass relation naturally.

Produces a non-degenerate, possibly hierarchical, charged-slepton spectrum.

Suppresses flavor-changing neutral currents by diagonalizing mass matrices simultaneously.

Abstract

New mechanism of generating flavor mass spectrum is proposed by using an O'Raifeartaigh-type supersymmetry breaking model. A desired bilinear form of fermion mass spectrum is naturally realized through F-components of gauge-singlet (nonet of SU(3) flavor symmetry) superfields, and the suitable charged-lepton mass relation is reproduced. The charged-slepton mass spectrum is non-degenerate in general, and can be even hierarchical (proportional to the charged-lepton masses in the specific case). Flavor changing neutral processes are suppressed since the charged-lepton and slepton (except for right-handed sneutrino) mass matrices are diagonalized simultaneously in the flavor space. The right-handed sneutrinos are light with the similar ratio to the lepton sector ($\tilde{m}_{\nu_R}$/$\tilde{m}_e \sim m_\nu$/$m_e$).