QCD Amplitudes in the High-Energy Limit

Abstract

Dijet production with a rapidity gap between the jets is considered as a test ground for the production of a heavy Higgs boson via weak-boson fusion at hadron supercolliders. It is argued that in order to perform a detailed analysis of dijet production with a rapidity gap we need an $\mathcal{O}({\text{al}}_s^4)$ calculation including the relevant collinear enhancements which give structure to the jets. Such a calculation needs not be exact, but must include the full leading power in $\hat{s}/\hat{t}$ of the rate of dijet production in the high-energy limit. The QCD amplitudes must be determined to the corresponding accuracy. Accordingly, the scattering amplitudes necessary to compute the full leading power in $\hat{s}/\hat{t}$ of dijet production to $\mathcal{O}({\text{al}}_s^3)$ are analysed.

Comments: LaTeX, 18 pages. To appear in the Proceedings of LISHEP98, Rio, Brasil, February 1998