具有部分子簇射和强子化效应的QCD中NLO精度的t tbar W和t tbar Z强子产生
t tbar W and t tbar Z Hadroproduction at NLO accuracy in QCD with Parton Shower and Hadronization effects
摘要：
我们提出了理论预测的强子产生的t tbar W+，t tbar W-和t tbar Z在LHC作为匹配的数值计算在QCD的非线性光学精度与淋浴蒙特卡罗程序。计算由PowHel执行，依赖于POWHEG-BOX框架，允许固定阶计算之间的匹配，输入由HELAC-NLO事件发生器集合产生的矩阵元素，以及Parton Shower演化，然后是PYTHIA和HERWIG描述的强子化和强子衰变。我们重点讨论了CMS协作组最近研究的双轻子和三轻子衰变通道。
英文摘要：
We present theoretical predictions for the hadroproduction of t tbar W+, t tbar W- and t tbar Z at LHC as obtained by matching numerical computations at NLO accuracy in QCD with Shower Monte Carlo programs. The calculation is performed by PowHel, relying on the POWHEG-BOX framework, that allows for the matching between the fixed order computation, with input of matrix elements produced by the HELAC-NLO collection of event generators, and the Parton Shower evolution, followed by hadronization and hadron decays as described by PYTHIA and HERWIG. We focus on the dilepton and trilepton decay channels, studied recently by the CMS Collaboration.
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