Supersimple analysis of e-e+ →zH at high energy

Abstract

We study the process e-e+→ZH where H represents the standard model (SM) Higgs particle HSM, or the minimal supersymmetric standard model (MSSM) ones h0 and H0. In each case, we compute the one-loop effects and establish very simple expressions, called supersimple (sim), for the helicity-conserving (dominant) and the helicity-violating (suppressed) amplitudes. Such expressions are then used to construct various cross sections and asymmetries, involving polarized or unpolarized beams and Z-polarization measurements. We examine the adequacy of such expressions to distinguish SM from MSSM effects or from other types of beyond the standard model contributions.