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As experimental constraints on the parameter space of the MSSM and closevariations thereof become stronger, the motivation to explore supersymmetricmodels that challenge some of the standard assumptions of the MSSM also becomestronger. For example, models where the gauginos are Dirac instead of Majoranahave recently received more attention. Beside allowing for a supersoft SUSYbreaking mechanism where the gauginos only provide finite threshold correctionsto scalar masses, the cross section for the production of a squark pairs isreduced. In addition, Dirac gauginos can be used to build models that possess aU(1)R symmetry. This symmetry can then be identified with a lepton number,leading to models that are quite different from conventional scenarios. Thesneutrinos in these models can acquire a vev and give mass to the leptons andthe down-type squark. The phenomenology is novel, combining signatures that aretypical of R-parity violating scenarios with signatures arising fromleptoquarks. Correspondingly the constraints from electroweak precision dataare also different. In these models, one of the leptons mixes with gauginos andsuperpotential Yukawa couplings can contribute to EWPM at tree level. Inaddition, lepton universality is broken. In this paper we adapt the operatorsanalysis of Han and Skiba [1] to include the relevant violation of leptonuniversality, and do a global fit of the model to electroweak precision data,including all relevant tree-level and loop-level effects. We obtain bounds onthe vev of the sneutrino and on the superpotential couplings of the model.

Electroweak precision measurements in supersymmetric models with a U(1)R lepton number