Title: High energy QCD and hard diffraction at HERA versus Tevatron
Abstract: We present and discuss two dierent topics where Tevatron and HERA data can be compared directly. A method allowing for a direct comparison of data with theoretical predictions is proposed for forward jet production at HERA. An application to the determination of the eective Pomeron intercept in the BFKL-LO parametrization from d=dx data at HERA leads to a good t with a signicantly high eective intercept, P =1 :43 0:025(stat:) 0:025(syst:). It is less than the value of the pomeron intercept using dijets with large rapidity intervals obtained at Tevatron. In a second part of this report, we make comparison between diractive results at HERA and at Tevatron. We rst give the parton distributions in the pomeron extracted from HERA data, and compare with hard single diraction at Tevatron and diractive dijets with a leading antiproton data. 1 Forward jets at HERA and Mueller-Navelet jets at Tevatron 1.1 Forward jets at HERA The study of forward jets at ep colliders is considered as the milestone of QCD studies at high energies, since it provides a direct way of testing the perturbative resummations of soft gluon radiation. It is similar to the previous proposal of studying two jets separated by a large rapidity interval in hadronic colliders 1 , for which preliminary results are available 2 . The cross-section for forward jet production at HERA in the dipole model reads 5 :
Publication Year: 1999
Publication Date: 1999-01-01
Language: en
Type: article
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