H1prelim-08-163

Search for Lepton Flavor Violation at HERA II

Reference Preliminary results expected for summer 2008,
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Abstract A search for the lepton flavour violating processes ep->mu X and ep -> tau X is performed with the H1 experiment at HERA. Final states with a muon or tau and a hadronic jet are searched for. This search uses all HERA II data collected by the H1 experiment, corresponding to integrated luminosities of 178 pb-1 and 159 pb-1 for e+p and e-p collisions, respectively. No evidence for lepton flavour violation is found. Limits are derived on the mass and the couplings of leptoquarks inducing lepton flavour violation in an extension of the Buchm"uller-R"uckl-Wyler effective model. Especially the sensitivity to leptoquarks with fermion number F = 2 is increased with respect to the previous H1 results.
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