QCD Matrix Elements + Parton Showers

Details QCD Matrix Elements + Parton Showers QCD Matrix Elements + Parton Showers

2001-09-25

arxiv.org/abs/hep-ph/0109231v1

JHEP 0111:063,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 11 figures, uses JHEP.cls

Scientific paper

10.1088/1126-6708/2001/11/063

We propose a method for combining QCD matrix elements and parton showers in Monte Carlo simulations of hadronic final states in $e^+e^-$ annihilation. The matrix element and parton shower domains are separated at some value $y_{ini}$ of the jet resolution, defined according to the $k_T$-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 $y_{ini}$ 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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