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2007

Gaining analytic control of parton showers

Bauer, Christian W., Tackmann, Frank J.

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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.

Gaining analytic control of parton showers · Around

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T. Sjöstrand and P. Z. Skands, Eur. Phys. J. C 39

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For other recent work on estimating uncertainties in parton showers see: P. Stephens and A. van Hameren, arXiv:hep-ph/0703240

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For a pedagogical introduction see: T. Sjöstrand, arXiv:hep-ph/0611247; and for a more detailed review the Pythia

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We thank Peter Skands for discussions on this point

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O. Latunde-Dada, S. Gieseke and B. R. Webber, JHEP 0702

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