PROGRESS IN NEXT-TO-LEADING ORDER CALCULATIONS

by Zoltan TROCSANYI (Univ. of Debrecen)

Friday 30 Nov 2001, 14:00 → 15:00 Europe/Zurich

TH Auditorium (CERN)

In this talk I review new results in NLO calculations. In the first part, I am going to present a generalization of the dipole subtraction method to processes involving massive partons. The theory is QCD, although the method has also been applied for calculating electroweak corrections elsewhere. Particular emphasis is devoted to the smooth small-mass (or equivalently high-energy) behaviour of the cross sections. The singular structure of one-loop amplitudes of massive partons (QCD, SUSY QCD) is also derived. In the second part of the talk I present NLO predictions to three-jet leptoproduction and compare the predictions to recent data obtained with the H1 detector at HERA. The inclusion of the NLO corrections decreases the scale-dependence of the predictions significantly and improves the agreement between data and predictions remarkably.