Ultra-heavy particle production from heavy partons at hadron colliders

Abstract

The existence of heavy partons in the proton can have important consequences for hard scattering processes at high-energy hadron colliders. Nevertheless, by naively using heavy-parton distribution functions, one may be double-counting, since the origin of the heavy partons is due to pair production from gluons inside the proton. Using perturbative QCD, we develop a technique by which heavy-parton distribution functions may be used in a consistent manner. We illustrate the technique with two examples of the production of ultra-heavy particles: heavy squark production due to gluino-quark fusion and heavy charged Higgs production via tb fusion.