Search for Heavy Pointlike Dirac Monopoles

Abstract

We have searched for central production of a pair of photons with high transverse energies in $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$ using $70{\mathrm{pb}}^{\ensuremath{-}1}$ of data collected with the D0 detector at the Fermilab Tevatron in 1994--1996. If they exist, virtual heavy pointlike Dirac monopoles could rescatter pairs of nearly real photons into this final state via a box diagram. We observe no excess of events above background, and set lower $95%$ C.L. limits of 610, 870, or $1580\mathrm{GeV}{/c}^{2}$ on the mass of a spin 0, $1/2$, or 1 Dirac monopole.