Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-05-14
Phys.Rev.D76:114017,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 6 figures, v2: final journal version
Scientific paper
10.1103/PhysRevD.76.114017
Parton showers are widely used to generate fully exclusive final states needed to compare theoretical models to experimental observations. While, in general, parton showers give a good description of the experimental data, the precise functional form of the probability distribution underlying the event generation is generally not known. The reason is that realistic parton showers are required to conserve four-momentum at each vertex. In this paper we investigate in detail how four-momentum conservation is enforced in a standard parton shower and why this destroys the analytic control of the probability distribution. We show how to modify a parton shower algorithm such that it conserves four-momentum at each vertex, but for which the full analytic form of the probability distribution is known. We then comment how this analytic control can be used to match matrix element calculations with parton showers, and to estimate effects of power corrections and other uncertainties in parton showers.
Bauer Christian W.
Tackmann Frank J.
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