Higgs decays in supersymmetric models with light neutralinos

In the minimal supersymmetric standard model, neutralinos lighter than 50 GeV are compatible with all accelerator, precision, and cosmological bounds. Such neutralinos might constitute a relevant decay channel for the Higgs boson, modifying its expected signatures at hadron colliders. We study the branching ratio h ->chi chi and determine the region in the supersymmetric parameter space where it is significant. We have found that, in fact, the Higgs may dominantly decay into neutralino pairs. Besides, as a result of this new channel, the branching ratio into visible modes, such as h ->gamma gamma, gets suppressed.