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2011

Matching Tree-Level Matrix Elements with Interleaved Showers

Lonnblad, Leif, Prestel, Stefan

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We present an implementation of the so-called CKKW-L merging scheme for combining multi-jet tree-level matrix elements with parton showers.

The implementation uses the transverse-momentum-ordered shower with interleaved multiple interactions as implemented in PYTHIA8.
We validate our procedure using e+e--annihilation into jets and vector boson production in hadronic collisions, with special attention to details in the algorithm which are formally sub-leading in character, but may have visible effects in some observables.
We find substantial merging scale dependencies induced by the enforced rapidity ordering in the default PYTHIA8 shower.

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