GenEvA (I): a new framework for event generation

被引：21

作者：

Bauer, Christian W. ^{[1
]}

Tackmann, Frank J. ^{[1
]}

Thaler, Jesse ^{[1
]}

机构：

[1] Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2008年 / 12期

关键词：

Jets; Phenomenological Models; NLO Computations; QCD;

D O I：

10.1088/1126-6708/2008/12/010

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

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(vertical bar) 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 [1].

引用

页数：64

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