CP Violating Lepton Asymmetry from B Decays in Supersymmetric Grand Unified Theories

TL;DR

This paper explores how supersymmetric GUT models can explain the observed CP asymmetry in B decays through flavor violation and new phases, with implications for various phenomenological experiments.

Contribution

It demonstrates that large flavor violation and new phases in SU(5) and SO(10) GUT models can account for the observed CP asymmetry in B decays, linking it to neutrino mixing and phenomenology.

Findings

Large flavor violation between second and third generations due to neutrino mixing.

New phases in Yukawa couplings can produce the observed CP asymmetry.

Implications for rare decays, dark matter detection, and neutrino flux measurements.

Abstract

We investigate the effect of the dimuon CP asymmetry from the B decay modes, recently observed at 3.2 sigma deviation from the Standard Model (SM) by the D0 collaboration, in the context of SU(5) and SO(10) GUT models. We exhibit that a large amount of flavor violation between the second and the third generation is generated due to the large neutrino atmospheric mixing angle and this flavor violation can be responsible for the observed large CP asymmetry due to the presence of new phases (not present in the CKM matrix) in the Yukawa couplings. We also study the implication of the parameter space in these GUT models with large CP violating lepton asymmetry for different phenomenologies, e.g., Br(tau -> mu + gamma), Br(B_s -> mu + mu) at the Fermilab, direct detection of dark matter (DM) in the ongoing detectors and measurement of muon flux from solar neutrinos at the IceCube experiment.