A search for R-parity violating squark production with the H1 experiment at HERA

A search for R-parity violating supersymmetry is performed in the complete HERA data set taken at a centre-of-mass energy of √(s)=319 GeV with the H1 detector. The integrated luminosity of the data sets corresponds to 255 pb-1 of positron-proton, and 183 pb-1 of electron-proton collision data. By introducing a lepton-quark-squark coupling λ' the resonant production of single squarks is expected. Several exclusive selection channels, based on the topologies of final states expected from direct squark decays, and squark decays via gauginos are defined. The selection channels are based on an electron or a neutrino in the final state, and may contain further jets and leptons. All of the selection channels show a good agreement with the background expectation from standard model processes. The results are interpreted in terms of exclusion limits, obtained for the minimal supersymmetric standard model, and for the minimal supergravity model, constraining the strength of the R-parity violating couplings λ1j1' and λ11k', and the supersymmetric model parameters, under the single coupling dominance hypothesis. For an Rp coupling strength comparable to the electromagnetic coupling strength, λ1j1' or λ11k'=√(4παem)=0.3, squark masses up to 275 GeV are excluded for ujL squarks, with dkR squarks further excluded up to 290 GeV, for all three squark generations j,k=1,2,3 at the 95% confidence level. (orig.)