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arXiv 1102.2126hep-ph
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类时喷流的高阶修正

Higher-Order Corrections to Timelike Jets

W. T. Giele, D. A. Kosower, P. Z. Skands

摘要:

我们提出了一个简单的形式主义的类时喷流的演变,其中树级矩阵元校正可以系统地纳入,任意部分子多重性和所有的相空间,在某种程度上,指数匹配的校正。该方案被投射为一个簇射马尔可夫链,产生一个单一的未加权的事件样本,可以通过标准的强子化模型。剩余的扰动不确定性估计提供了几个替代的权重集相同的事件,在一个相对温和的额外开销。作为一个明确的例子,我们考虑了非极化无质量夸克的Z -> q qbar演化,并包括了几个形式上的次级改进以及通过α_s ^[4]与树级矩阵元的匹配。由此产生的算法在公开可用的VINCIA插件中实现到PYTHIA 8事件生成器。

英文摘要:

We present a simple formalism for the evolution of timelike jets in which tree-level matrix element corrections can be systematically incorporated, up to arbitrary parton multiplicities and over all of phase space, in a way that exponentiates the matching corrections. The scheme is cast as a shower Markov chain which generates one single unweighted event sample, that can be passed to standard hadronization models. Remaining perturbative uncertainties are estimated by providing several alternative weight sets for the same events, at a relatively modest additional overhead. As an explicit example, we consider Z -> q qbar evolution with unpolarized, massless quarks and include several formally subleading improvements as well as matching to tree-level matrix elements through alpha_s^4. The resulting algorithm is implemented in the publicly available VINCIA plugin to the PYTHIA 8 event generator.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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