Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-04-22
JHEP 0206:029,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
69 pages Latex; 16 figures included. Minor modifications to the text, three references added
Scientific paper
10.1088/1126-6708/2002/06/029
We propose a method for matching the next-to-leading order (NLO) calculation of a given QCD process with a parton shower Monte Carlo (MC) simulation. The method has the following features: fully exclusive events are generated, with hadronization according to the MC model; total exclusive rates are accurate to NLO; NLO results for distributions are recovered upon expansion in $\alpha_S$; hard emissions are treated as in NLO computations while soft/collinear emissions are handled by the MC simulation, with the same logarithmic accuracy as the MC; and matching between the hard- and soft/collinear-emission regions is smooth. A fraction of events with negative weight is generated, but unweighting remains possible with reasonable efficiency. The method is clarified using a simple toy model, and illustrated by application to the hadroproduction of W$^+$W$^-$ pairs.
Frixione Stefano
Webber Bryan R.
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