Some remarks on dipole showers and the DGLAP equation

Some remarks on dipole showers and the DGLAP equation
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关于偶极子簇射和 DGLAP 方程的一些评论

DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
S. Weinzierl
S. Weinzierl
中科院分区：
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文献类型：
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作者：
P. Skands;S. Weinzierl

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最近有人认为，基于色偶极子的部分子簇射与共线分解相冲突，不能导出正确的Dokshitzer-Gribov-Lipatov-Altarelli-Parisi（DGSTZ）方程。我们指出，这一结论是基于一个不恰当的假设，即选择胶子能量作为演化变量。我们进一步数值表明，Monte Carlo程序的基础上偶极淋浴与“红外敏感”的演化变量重现DGSTO方程的 * 渐近形式，以及在比较领先的行为的二阶QCD矩阵元素。
It has been argued recently that parton showers based on color dipoles conflict with collinear factorization and do not lead to the correct Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) equation. We show that this conclusion is based on an inappropriate assumption, namely, the choice of the gluon energy as evolution variable. We further show numerically that Monte Carlo programs based on dipole showers with "infrared-sensible" evolution variables reproduce the DGLAP equation both in * asymptotic form as well as in comparison to the leading behavior of second-order QCD matrix elements.