Search for bosonic stop decays in R-parity violating supersymmetry in e+p collisions at HERA

A search for scalar top quarks in R-parity violating supersymmetry is performed in e+p collisions at HERA using the H1 detector. The data, taken at s=319GeV and 301 GeV, correspond to an integrated luminosity of 106pb-1. The resonant production of scalar top quarks t-bar in positron quark fusion via an R-parity violating Yukawa coupling λ' is considered with the subsequent bosonic stop decay t-bar ->b-bar W. The R-parity violating decay of the sbottom quark b-bar ->dν-bar e and leptonic and hadronic W decays are considered. No evidence for stop production is found in the search for bosonic stop decays nor in a search for the direct R-parity violating decay t-bar ->eq. Mass dependent limits on λ' are obtained in the framework of the minimal supersymmetric Standard Model. Stop quarks with masses up to 275GeV can be excluded at the 95% confidence level for a Yukawa coupling of electromagnetic strength