Effective Lagrangian for theχj+χk−Hl0interaction in the minimal supersymmetric standard model and neutral Higgs decays

Abstract

We extend previous analyses of the supersymmetric loop correction to the neutral Higgs couplings to include the coupling {chi}{sub j}{sup +}{chi}{sub k}{sup -}H{sub l}{sup 0}. The analysis completes the previous analyses where similar corrections were computed for the {tau}{tau}H{sub l}{sup 0}, bbH{sub l}{sup 0}, ccH{sub l}{sup 0} and for ttH{sub l}{sup 0} couplings within the minimal supersymmetric standard model. The effective one-loop Lagrangian is then applied to the computation of the neutral Higgs decays. The sizes of the supersymmetric loop corrections of the neutral Higgs decay widths into {chi}{sub i}{sup +}{chi}{sub j}{sup -} (i=1, 2; j=1, 2) are investigated and the supersymmetric loop correction is found to be in the range of 7{approx}15% in significant regions of the parameter space. By including the loop corrections of the other decay channels bb, tt, {tau}{tau}, cc, and {chi}{sub i}{sup 0}{chi}{sub j}{sup 0} (i=1-4; j=1-4), the corrections to branching ratios for H{sub l}{sup 0}{yields}{chi}{sub i}{sup +}{chi}{sub j}{sup -} can reach as high as 40%. The effects of CP phases on the branching ratio are also investigated.