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arXiv 1303.4563hep-ph
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超标准模型物理中硬辐射衰变的蒙特卡罗模拟

Monte Carlo Simulation of Hard Radiation in Decays in Beyond the Standard Model Physics in Herwig++

Peter Richardson, Alexandra Wilcock

摘要:

我们在Herwig++事件发生器中使用POWHEG形式主义来匹配QCD实发射矩阵元素与部分子簇射,用于与超越标准模型物理搜索相关的一系列衰变。应用这种校正会影响实验观测量的形状,从而改变通过选择标准的事件的数量。为了验证这种方法,我们研究了修正对标准模型顶夸克衰变的影响。然后,我们说明的效果的校正超越标准模型的情况下,考虑不变的质量分布的最轻的Randall-Sundrum引力子的衰变和横向动量分布的超对称衰变中产生的双喷流。我们只考虑的效果的POWHEG校正模拟的最难的发射在淋浴和忽略校正的总宽度和分支比到下一个领先的顺序精度所需的归一化因子。

英文摘要:

We use the POWHEG formalism in the Herwig++ event generator to match QCD real-emission matrix elements with the parton shower for a range of decays relevant to Beyond the Standard Model physics searches. Applying this correction affects the shapes of experimental observables and so changes the number of events passing selection criteria. To validate this approach, we study the impact of the correction on Standard Model top quark decays. We then illustrate the effect of the correction on Beyond the Standard Model scenarios by considering the invariant-mass distribution of dijets produced in the decay of the lightest Randall-Sundrum graviton and transverse momentum distributions for decays in Supersymmetry. We consider only the effect of the POWHEG correction on the simulation of the hardest emission in the shower and ignore the normalisation factor required to correct the total widths and branching ratios to next-to-leading order accuracy.

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