Like-sign dimuon asymmetry of B0 meson and LFV in SU(5) SUSY GUT with S4 flavor symmetry

TL;DR

This paper explores how an SU(5) SUSY GUT model with S4 flavor symmetry can explain the like-sign dimuon asymmetry in B mesons and predicts related lepton flavor violation processes, providing testable predictions for future experiments.

Contribution

It introduces a novel SU(5) SUSY GUT framework with S4 flavor symmetry to connect B meson asymmetry with lepton flavor violation, offering specific testable predictions.

Findings

Predicted like-sign charge asymmetry aligns within 2σ of experimental results.

Leptonic processes like μ→eγ and electron EDM are near current experimental bounds.

Tau decay ratios are related via the Cabibbo angle, providing testable predictions.

Abstract

The like-sign dimuon charge asymmetry of the $B$ meson, which was reported in the D$\O$ Collaboration, is studied in the SU(5) SUSY GUT model with $S_4$ flavor symmetry. Additional CP violating effects from the squark sector are discussed in $B_s-\bar B_s$ mixing process. The predicted like-sign charge asymmetry is in the 2$\sigma$ range of the combined result of D$\O$ and CDF measurements. Since the SUSY contributions in the quark sector affect to the lepton sector because of the SU(5) GUT relation, two predictions are given in the leptonic processes: (i) both ${\rm BR}(\mu \to e \gamma)$ and the electron EDM are close to the present upper bound, (ii) the decay ratios of $\tau$ decays, $\tau \to \mu\gamma$ and $\tau \to e \gamma$, are related to each other via the Cabibbo angle $\lambda_c$: ${\rm BR}(\tau \to e\gamma)/{\rm BR}(\tau \to \mu\gamma)\sime \lambda_c^2$. These are testable at future experiments.