Search for charged Higgs bosons in e+e− collisions at –202 GeV

A search for pair-produced charged Higgs bosonswas performed in the high energy data collected by the DELPHI detector at LEP II at centre-of-mass energies from 189 GeV to 202 GeV. The three different final states, τντν, and were considered. New methods were applied to reject wrong hadronic jet pairings and for the tau identification, where a discriminator based on tau polarisation and polar angles was used. No excess of data compared to the expected Standard Model processes was observed and the existence of a charged Higgs bosonwith mass lower than 71.5 GeV/c2 is excluded at the 95% confidence level.