Reweighting QCD matrix-element and parton-shower calculations

Reweighting QCD matrix-element and parton-shower calculations
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DOI:
10.1140/epjc/s10052-016-4430-0
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发表时间:
2016-06
期刊:
The European Physical Journal C
影响因子:
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通讯作者:
E. Bothmann;M. Schönherr;S. Schumann
E. Bothmann;M. Schönherr;S. Schumann
中科院分区:
其他
文献类型:
--
作者:
E. Bothmann;M. Schönherr;S. Schumann

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我们介绍了用于在 Sherpa 事件生成器框架内有效评估矩阵元加部分喷淋模拟中的参数和微扰理论不确定性的技术的实现和验证。通过跟踪完整的 PDF 依赖性(包括部分顿簇分量以及固定阶尺度不确定性),我们可以动态计算变分事件权重,从而大大降低获得理论不确定性估计的计算成本。
We present the implementation and validation of the techniques used to efficiently evaluate parametric and perturbative theoretical uncertainties in matrix-element plus parton-shower simulations within theSherpaevent-generator framework. By tracing the fulland PDF dependences, including the parton-shower component, as well as the fixed-order scale uncertainties, we compute variational event weights on-the-fly, thereby greatly reducing the computational costs to obtain theoretical-uncertainty estimates.