Flavour Physics in an SO(10) Grand Unified Model

TL;DR

This paper explores how a specific SO(10) grand unified model links neutrino mixing to quark transitions, predicting observable flavor-changing processes and offering an alternative benchmark to the MSSM.

Contribution

It introduces a detailed analysis of flavor-changing neutral currents within the CMM SO(10) model, connecting neutrino mixing to quark sector transitions in a supersymmetric GUT framework.

Findings

Large b -> s and tau -> mu transitions are induced by neutrino mixing.

The model provides a correlated prediction for several FCNC processes.

It offers an alternative benchmark scenario to the constrained MSSM.

Abstract

Grand unified theories open the possibility to transfer the neutrino mixing matrix U_PMNS to the quark sector. This is accomplished in a controlled way in a supersymmetric grand-unified model proposed by Chang, Masiero and Murayama (CMM model) where the atmospheric neutrino mixing angle induces large new b -> s and tau -> mu transitions. Relating the supersymmetric low-energy parameters to seven new parameters a_0, m_0^2, m_tilde{g}, D, xi, tan beta and arg(mu) of this SO(10) model, we perform a correlated study of several flavour-changing neutral current (FCNC) processes. The CMM model can serve as an alternative benchmark scenario to the popular constraint MSSM.