Hard Colour Singlet Exchange at the Tevatron

Abstract

: We have performed a detailed phenomenological investigation of the hard colour singlet exchange process which is observed at the Tevatron in events which have a large rapidity gap between outgoing jets. We include the effects of multiple interactions to obtain a prediction for the gap survival factor. Comparing the data on the fraction of gap events with the prediction from BFKL pomeron exchange we find agreement provided that a constant value of ff s is used in the BFKL calculation. Moreover, the value of ff s is in line with that extracted from measurements made at HERA. Keywords: QCD, Jets, Phenomenological Models, Hadronic Colliders. On leave of absence from Dept. of Physics and Astronomy, University of Manchester Contents 1. Introduction 1 1.1 The theoretical calculation 2 1.2 D data versus the BFKL pomeron 3 1.3 Underlying events and gap survival 4 2. Gap survival and multiple interactions 5 3. Results 8 3.1 Cross-sections at the parton and hadron level 8 3.2 Gap fractions ...