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In R-parity violating supersymmetry a gaugino can be produced at HERA by the t-channel exchange of a selectron between the beam positron or electron and an initial quark from the beam proton. In the generic MSSM model the gaugino can decay in a cascade into two quarks and an (anti)lepton. For this model a search in the e^{+-}-channel has been performed with the ZEUS detector using combined e^{+-}p-data of L_{int}=121pb^{-1}. No deviations from the Standard Model have been observed and exclusion limits on parameters of the MSSM have been set. Assuming the GMSB model with the gravitino as lightest supersymmetric particle and the neutralino as next-to-lightest supersymmetric particle, the neutralino decays into a gravitino and a high-energy photon. For this model searches have been performed with the H1 detector using e^+p-data of L_{int}=64.3pb^{-1} and e^-p-data of L_{int}=13.5pb^{-1} and with the ZEUS detector using e^+p-data of L_{int}=65.1pb^{-1}. No deviations from the Standard Model have been observed and limits on the selectron and neutralino masses have been set. Additionally, limits on the R-parity violating Yukawa coupling have been derived in the search performed with the H1 detector.
A search for single top production in ep collisions using the complete high energy data from HERA is presented. This search is based on the analysis of events containing isolated leptons (electrons or muons) and missing transverse momentum PTmiss. In
A search for single-top production, $ep rightarrow etX$, has been performed with the ZEUS detector at HERA using data corresponding to an integrated luminosity of $0.37fbi$. No evidence for top production was found, consistent with the expectation fr
A search for stop production in R-parity-violating supersymmetry has been performed in $e^{+}p$ interactions with the ZEUS detector at HERA, using an integrated luminosity of 65 pb$^{-1}$. At HERA, the R-parity-violating coupling $lambda$ allows reso
Recent results on the searches for new physics in ep collisions at HERA using the ZEUS and H1 detectors are presented. No evidence for excited fermions or supersymmetric particles within the context of the Minimal Supersymmetric Standard Model nor R-
Recent results on searches for new particles at the electron-proton collider HERA are reported. Based on roughly 40pb-1 of e^+p data taken in the years 1994-1997, the H1 and ZEUS collaborations have derived new exclusion limits for the direct product