This paper presents a search for anomalous production of multiple low-energy
leptons in association with a W or Z boson using events collected at the CDF
experiment corresponding to 5.1 fb$^{-1}$ of integrated luminosity. This search
is sensitive to a wide range of topologies with low-momentum leptons, including
those with the leptons near one another. The observed rates of production of
additional electrons and muons are compared with the standard model
predictions. No indications of phenomena beyond the standard model are found. A
95% confidence level limit is presented on the production cross section for a
benchmark model of supersymmetric hidden-valley Higgs production. Particle
identification efficiencies are also provided to enable the calculation of
limits on additional models.
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