Monte Carlo tuning in the presence of Matching

Details Monte Carlo tuning in the presence of Matching Monte Carlo tuning in the presence of Matching

2011-09-24

arxiv.org/abs/1109.5295v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 10 figures

Scientific paper

We consider the impact of varying alpha_s choices (and scales) on each side of the so-called "matching scale" in MLM-matched matrix-element + parton-shower predictions of collider observables. We explain how inconsistent prescriptions can lead to counter-intuitive results and present a few explicit examples, focusing mostly on W/Z + jets processes. We give a specific prescription for how to improve the consistency of the matching and also address how to perform consistent tune variations (e.g., of the renormalization scale) around a central choice. Comparisons to several collider processes are included to illustrate the properties of the resulting improved matching, relying on Alpgen+Pythia6, with the latter using the so-called Perugia 2011 tunes, developed as part of this effort.

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