A search for anomalous production of events with multiple leptons and a W or Z boson

A search is presented for anomalous production of events containing multiple low-energy leptons produced in association with a W or Z boson using the Collider Detector at Fermilab. The leptons are not required to be isolated, and the signature is therefore sensitive to a wide range of so-called "lepton jet" topologies. The search uses data corresponding to 5.1 fb--1 of integrated luminosity from pp¯ collisions at a center-of-mass energy of s = 1.96 TeV. The observed events are compared with the standard model predictions in bins of additional electron and muon multiplicity. No indications are found of phenomena beyond the standard model. A 95% confidence level limit is presented on the production cross section for an example benchmark point of a dark-matter inspired model of supersymmetric hidden valley Higgs production. Object identification efficiencies are also provided in order to enable the calculation of limits on additional models.