Abstract
We compare different procedures for combining fixed-order tree-level matrix
element generators with parton showers. We use the case of W-production at the
Tevatron and the LHC to compare different implementations of the so-called CKKW
scheme and one based on the so-called MLM scheme using different matrix element
generators and different parton cascades. We find that although similar results
are obtained in all cases, there are important differences.
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