B-Meson Observables in the Maximally CP-Violating MSSM with Minimal Flavour Violation

TL;DR

This paper develops a framework for analyzing CP violation effects in B-meson processes within a specific MSSM variant, revealing how new CP-violating parameters influence observable meson decays and mixing.

Contribution

It introduces the MCPMFV MSSM with 19 parameters, including 6 CP-violating phases, and develops a flavor-covariant formalism for calculating Higgs-mediated FCNC processes at large tan(beta).

Findings

New CP-violating effects can significantly impact B-meson observables.

Constraints from experimental data limit the MCPMFV parameter space.

Potential observable CP asymmetry in b --> s gamma decay within this framework.

Abstract

Additional sources of CP violation in the MSSM may affect B-meson mixings and decays, even in scenarios with minimal flavour violation (MFV). We formulate the maximally CP-violating and minimally flavour-violating (MCPMFV) variant of the MSSM, which has 19 parameters, including 6 phases that violate CP. We then develop a manifestly flavour-covariant effective Lagrangian formalism for calculating Higgs-mediated FCNC observables in the MSSM at large tan(beta), and analyze within the MCPMFV framework FCNC and other processes involving B mesons. We include a new class of dominant subleading contributions due to non-decoupling effects of the third-generation quarks. We present illustrative numerical results that include effects of the CP-odd MCPMFV parameters on Higgs and sparticle masses, the B_s and B_d mass differences, and on the decays B_s --> mu+ mu-, B_u --> tau nu and b --> s gamma. We use these results to derive illustrative constraints on the MCPMFV parameters imposed by D0, CDF, BELLE and BABAR measurements of B mesons, demonstrating how a potentially observable contribution to the CP asymmetry in the b --> s gamma decay may arise in the MSSM with MCPMFV.