Hidden-Sector Dynamics and the Supersymmetric Seesaw

TL;DR

This paper explores how hidden-sector dynamics in supersymmetric models with a seesaw mechanism for neutrino masses can significantly influence low-energy predictions, especially regarding flavor violation and parameter reconstruction.

Contribution

It extends previous studies by analyzing the effects of hidden-sector dynamics on the RGEs in seesaw-extended MSSM models, highlighting their impact on flavor mixing and low-energy observables.

Findings

Hidden-sector effects alter slepton mixing patterns.

Significant changes in charged-lepton flavor violation levels.

Hidden-sector dynamics complicate the reconstruction of seesaw parameters.

Abstract

In light of recent analyses that have shown that nontrivial hidden-sector dynamics in models of supersymmetry breaking can lead to a significant impact on the predicted low-energy supersymmetric spectrum, we extend these studies to consider hidden-sector effects in extensions of the MSSM to include a seesaw model for neutrino masses. A dynamical hidden sector in an interval of mass scales below the seesaw scale would yield renormalization-group running involving both the anomalous dimension from the hidden sector and the seesaw-extended MSSM renormalization group equations (RGEs). These effects interfere in general, altering the generational mixing of the sleptons, and allowing for a substantial change to the expected level of charged-lepton flavour violation in seesaw-extended MSSM models. These results provide further support for recent theoretical observations that knowledge of the hidden sector is required in order to make concrete low-energy predictions, if the hidden sector is strongly coupled. In particular, hidden-sector dynamics may impact our ability to reconstruct the supersymmetric seesaw parameters from low-energy observations.