B(d,s)-anti-B(d,s) mixing and Lepton Flavour Violation in SUSY GUTs: impact of the first measurements of phi(s)

TL;DR

This paper investigates how recent measurements of the CP phase phi_s influence predictions of Lepton Flavour Violation in SUSY GUT models, highlighting the potential for future experiments to test these theories.

Contribution

It provides a re-analysis of B(d,s)-anti-B(d,s) mixing and LFV in SUSY GUTs considering new experimental data, establishing bounds on LFV processes.

Findings

Recent phi_s measurement excludes lowest tau --> mu + gamma rates.

Sets a lower bound of ~3E-9 for tan beta=10 on LFV branching ratios.

Future measurements will critically test SUSY GUT predictions.

Abstract

In this work we re-examine the correlation between B(d,s)-anti-B(d,s) mixing and Lepton Flavour Violation in the light of recent experimental measurements in the $B_s$ system. We perform a generic SUSY analysis of the allowed down squark mass insertion parameter space. In the SUSY GUT scenario this parameter space is then used to make predictions for LFV branching ratios. We find that the recent measurement for the CP phase $\phi_s$ excludes the lowest rates for tau --> mu + gamma and provides a lower bound of ~ 3E-9 for tan beta = 10. Future experimental improvements in the bound on tau --> mu + gamma and the measurement of phi(s) will constitute a strong test of the SUSY GUT scenario.