New Limits on the Production of Magnetic Monopoles at Fermilab
  First results from an experiment (Fermilab E882) searching for magnetically charged particles bound to elements from the CDF and D{\O}detectors are reported. The experiment is described, and limits on magnetic monopole pair production cross sections for magnetic charges 1, 2, 3, and 6 times the Dirac pole strength are presented. These limits ($\sim1$ pb), hundreds of times smaller than those found in previous direct accelerator-based searches, use simple model assumptions for the photonic production of monopoles, as does the extraction of mass limits in the hundreds of GeV range. 
K. A. Milton, G. R. Kalbfleisch, M. G. Strauss, L. Gamberg, W. Luo,   and E. H. Smith