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arXiv 1301.0933hep-ph
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螺旋度相关簇射和与VINCIA的匹配

Helicity-Dependent Showers and Matching with VINCIA

Andrew J. Larkoski, Juan J. Lopez-Villarejo, Peter Skands

摘要:

我们提出了一个天线簇射形式主义,包括螺旋度依赖的无质量部分子。形式主义适用于传统的(全球)淋浴和部门为基础的变种。我们结合淋浴与VINCIA的乘法矩阵元素匹配的方法,推广到每个螺旋配置单独操作。其结果是在计算速度的高部分子多重性的实质性增益。我们提出了一个实施部门和全球淋浴,最小和最大的变化,和螺旋度依赖的树级匹配适用于矢量玻色子或希格斯衰变到q qbar加上高达4胶子和希格斯衰变到高达5胶子。

英文摘要:

We present an antenna-shower formalism that includes helicity dependence for massless partons. The formalism applies to both traditional (global) showers and to sector-based variants. We combine the shower with VINCIA's multiplicative approach to matrix-element matching, generalized to operate on each helicity configuration separately. The result is a substantial gain in computational speed for high parton multiplicities. We present an implementation of both sector and global showers, with min and max variations, and helicity-dependent tree-level matching applied for vector bosons or Higgs decay to q qbar plus up to 4 gluons and for Higgs decay to up to 5 gluons.

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