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High Energy Physics - Phenomenology

arXiv:0801.4026 (hep-ph)
[Submitted on 28 Jan 2008 (v1), last revised 5 Sep 2008 (this version, v2)]

Title:GenEvA (I): A new framework for event generation

Authors:Christian W. Bauer, Frank J. Tackmann, Jesse Thaler
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Abstract: We show how many contemporary issues in event generation can be recast in terms of partonic calculations with a matching scale. This framework is called GenEvA, and a key ingredient is a new notion of phase space which avoids the problem of phase space double-counting by construction and includes a built-in definition of a matching scale. This matching scale can be used to smoothly merge any partonic calculation with a parton shower. The best partonic calculation for a given region of phase space can be determined through physics considerations alone, independent of the algorithmic details of the merging. As an explicit example, we construct a positive-weight partonic calculation for e+e- -> n jets at next-to-leading order (NLO) with leading-logarithmic (LL) resummation. We improve on the NLO/LL result by adding additional higher-multiplicity tree-level (LO) calculations to obtain a merged NLO/LO/LL result. These results are implemented using a new phase space generator introduced in a companion paper [arXiv:0801.4028].
Comments: 60 pages, 22 figures, v2: corrected typos, added references
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:0801.4026 [hep-ph]
  (or arXiv:0801.4026v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.0801.4026
Journal reference: JHEP 0812:010,2008
Related DOI: https://doi.org/10.1088/1126-6708/2008/12/010

Submission history

From: Frank Tackmann [view email]
[v1] Mon, 28 Jan 2008 20:08:37 UTC (271 KB)
[v2] Fri, 5 Sep 2008 22:29:51 UTC (272 KB)
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