B meson Dileptonic Decays in NMSSM with a Light CP-odd Higgs Boson

TL;DR

This paper investigates how a light CP-odd Higgs boson in the NMSSM can significantly enhance rare B meson dileptonic decays, providing predictions and constraints based on current experimental data.

Contribution

It analyzes the impact of a light CP-odd Higgs in NMSSM on rare B decays, highlighting potential enhancements and experimental constraints in this scenario.

Findings

Branching ratios can be greatly enhanced in allowed parameter space.

Current experiments like LEP II and b->s gamma constrain the parameter space.

Predictions for other dileptonic decay ratios and asymmetries are provided.

Abstract

In the next-to-minimal supersymmetric model (NMSSM) a light CP-odd Higgs boson is so far allowed by current experiments, which, together with a large tan-beta, may greatly enhance the rare dileptonic decays B-> X_s l^+ l^- and B_s-> l^+ l^- gamma. We examine these decays paying special attention to the new operator allowed by the light CP-odd Higgs boson. We find that in the parameter space allowed by current experiments like LEP II and b-> s gamma, the branching ratios of these rare decays can be greatly enhanced and thus the existing experimental data on B-> X_s mu^+ mu^- can further stringently constrain the parameter space (especially the region with a super-light CP-odd Higgs boson and large tan-beta). In the surviving parameter space we give the predictions for other dileptonic decay branching ratios and also show the results for the forward-backward asymmetry.