Abstract
The production rate and kinematic distributions of isolated photon pairs produced in hadron interactions are studied. The effects of the initial-state multiple soft-gluon emission to the scattering subprocesses $q\overline{q},qg,$ and $g\stackrel{\ensuremath{\rightarrow}}{g}\ensuremath{\gamma}\ensuremath{\gamma}X$ are resummed with the Collins-Soper-Sterman soft gluon resummation formalism. The effects of fragmentation photons from $q\stackrel{\ensuremath{\rightarrow}}{g}\ensuremath{\gamma}q,$ followed by $\stackrel{\ensuremath{\rightarrow}}{q}\ensuremath{\gamma}X,$ are also studied. The results are compared with data from the Fermilab Tevatron collider. A prediction of the production rate and kinematic distributions of the diphoton pair in proton-nucleon reactions is also presented.
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