QCD Matrix Elements + Parton Showers

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Published 4 January 2002 Published under licence by IOP Publishing Ltd
, , Citation Stefano Catani et al JHEP11(2001)063 DOI 10.1088/1126-6708/2001/11/063

1126-6708/2001/11/063

Abstract

We propose a method for combining QCD matrix elements and parton showers in Monte Carlo simulations of hadronic final states ine+e annihilation. The matrix element and parton shower domains are separated at some value yini of the jet resolution, defined according to the kT-clustering algorithm. The matrix elements are modified by Sudakov form factors and the parton showers are subjected to a veto procedure to cancel dependence on yini to next-to-leading logarithmic accuracy. The method provides a leading-order description of hard multi-jet configurations together with jet fragmentation, while avoiding the most serious problems of double counting. We present first results of an approximate implementation using the event generator APACIC++.

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