Disentangling Mass and Mixing Hierarchies

Simon Knapen and Dean J. Robinson

Phys. Rev. Lett. 115, 161803 – Published 15 October 2015

Abstract

We present a fully perturbative mechanism that naturally generates mass hierarchies for the standard model (SM) fermions in a flavor-blind sector. The dynamics generating the mass hierarchies can therefore be independent from the source of flavor violation, and hence this dynamics may operate at a much lower scale. This mechanism works by dynamically enforcing simultaneous diagonalization—alignment—among a set of flavor-breaking spurions, as well as generating highly singular spectra for them. It also has general applications in model building beyond the SM, wherever alignment between exotic and SM sources of flavor violation is desired.

Received 16 July 2015

DOI:https://doi.org/10.1103/PhysRevLett.115.161803

Authors & Affiliations

Simon Knapen and Dean J. Robinson

Department of Physics, University of California, Berkeley, California 94720, USA and Ernest Orlando Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA