Sflavor mixing map viewed from a high scale in supersymmetric SU(5)

TL;DR

This paper investigates flavor violation constraints in supersymmetric SU(5) grand unification, analyzing how quark and lepton observables restrict sfermion mixings and exploring implications for upcoming experiments.

Contribution

It provides a model-independent analysis of flavor violation in SUSY SU(5), highlighting the impact of scalar mass scales on quark and lepton sector constraints.

Findings

Lepton flavor violation strongly constrains right-handed down-type squark mixing.

Higher scalar masses shift the dominant constraints to quark sector observables.

The study discusses implications for B_s mixing phase deviations and experimental sensitivities.

Abstract

We study flavor violation in a supersymmetric SU(5) grand unification scenario in a model-independent way employing mass insertions. We examine how the quark and the lepton sector observables restrict sfermion mixings. With a low soft scalar mass, a lepton flavor violating process provides a stringent constraint on the flavor structure of right-handed down-type squarks. In particular, mu -> e gamma turns out to be highly susceptible to the 1-3 and 2-3 mixings thereof, due to the radiative correction from the top Yukawa coupling to the scalar mass terms of 10. With a higher scalar mass around the optimal value, in contrast, the quark sector inputs such as B-meson mixings and hadron electric dipole moment, essentially determine the room for sfermion mixing. We also discuss the recent deviation observed in B_s mixing phase, projected sensitivity of forthcoming experiments, and ways to maintain the power of leptonic restrictions even after incorporating a solution to fix the incorrect quark-lepton mass relations.