Upper limit of the Hypertriton production in the Ar+KCl collision system at 1.76 AGeV with HADES

In September 2005 data of the collision system Ar+KCl at a kinetic beam energy of 1.76 GeV per nucleon was measured with HADES. In this context several strange particles, which are suitable probes of the high density phase in heavy ion collisions, have been successfully reconstructed. Among them is the hypertriton, the lightest of the so called hypernuclei, which decays into a helium nucleus and a negative pion with a branching ratio of about 35%. In this contribution we present the results of this investigation. Since the hypertriton is not observed in the given system, we calculate an upper limit for the production of this particle.