Review of the chargino search in DELPHI: Latest results at E_{cm} = 189 GeV

An update of the searches for charginos is presented, based on a data sample corresponding to the 158 pb-1 recorded by the DELPHI detector in 1998, at a centre-of-mass energy of 189 GeV. No evidence for a signal was found. The lower mass limits are 4-5 GeV/c2 higher than those obtained at a centre-of-mass energy of 183 GeV. The (mu,M_2) domain excluded by combining the chargino searches with neutralino searches at the Z resonance implies a limit on the mass of the lightest neutralino which, for a heavy sneutrino, is constrained to be above 31.5 GeV/c2 for tan(beta) greater or equal 1.