Large Higgs boson exchange contribution in three-body neutralino decays

We show that the Higgs boson exchange contribution can be large in three-bo dy decays of neutralinos even in the case of small tan beta. This enlarges the branching ratios for the decays <(chi)over tilde>(0)(2) --> <(chi)over tilde>(0)(1) <b(b)over bar> and <(chi)over tilde>(0)(2) --> <(chi)over tild e>(0)(1) tau(-) tau(+). This is the case in the region of the parameter spa ce where the two lightest neutralinos are gaugino-like, the sfermions are h eavier than 300 GeV, and m(A0) less than or similar to 200 GeV. (C) 1999 Pu blished by Elsevier Science B.V. All rights reserved.