arXiv 1109.36082011-09-16hep-ph

利用扇形簇的有效矩阵元匹配

Efficient Matrix-Element Matching with Sector Showers

J. J. Lopez-Villarejo, P. Skands

备注：: 35 pages, 24 figures
DOI：: 10.1007/JHEP11(2011)150

摘要：

提出了一种基于“扇形天线”的马尔可夫簇射算法，并说明了它的主要性质。树级全色矩阵元素可以自动并入算法中，并被重新解释为依赖于过程的2 -> n天线函数。在相空间的硬部分，这些功能产生树级矩阵元素的淋浴校正。在软部件中，它们应该提高它的对数精度。每阶匹配所需的矩阵元素求值的数量是1，对于任意数量的腿，具有非常高的减重效率。总速率可以以简单的方式增加到NLO精度。作为一个概念的证明，我们提出了一个实现在公开可用的VINCIA插件的PYTHIA 8事件发生器，强子$Z^0$衰变，包括树级矩阵元素，通过${\cal O}(α_s^4)$。

英文摘要：

A Markovian shower algorithm based on "sector antennae" is presented and its main properties illustrated. Tree-level full-color matrix elements can be automatically incorporated in the algorithm and are re-interpreted as process-dependent 2 -> n antenna functions. In hard parts of phase-space, these functions generate tree-level matrix-element corrections to the shower. In soft parts, they should improve the logarithmic accuracy of it. The number of matrix-element evaluations required per order of matching is 1, with an unweighting efficiency that remains very high for arbitrary numbers of legs. Total rates can be augmented to NLO precision in a straightforward way. As a proof of concept, we present an implementation in the publicly available VINCIA plug-in to the PYTHIA 8 event generator, for hadronic $Z^0$ decays including tree-level matrix elements through ${\cal O}(α_s^4)$.

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英文摘要：

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