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arXiv 1407.7971hep-phhep-ex
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在NLO上与Parton阵雨匹配的夸克产生和衰变

Squark Production and Decay matched with Parton Showers at NLO

Ryan Gavin, Christian Hangst, Michael Krämer, Margarete Mühlleitner, Mathieu Pellen, Eva Popenda, Michael Spira

摘要:

本文扩展了LHC超对称粒子产生的预言,给出了前两代夸克和反夸克对产生的次领先阶超对称QCD修正的全微分计算.在非线性超对称QCD中,将非线性光学截面与末态(反)夸克衰变为最轻的中性伴子和(反)夸克的过程结合起来。没有假设的夸克质量,并考虑到独立的各个子通道。为了获得对微分分布的实际预测,固定阶计算必须与部分子簇射相结合。利用Powheg方法,我们已经实现了我们的结果在Powheg盒框架和接口的非线性光学计算的部分子簇射蒙特卡罗程序Pythia 6和Herwig++。该代码是公开的,可以从Powheg-Box网页下载。研究了NLO修正对微分分布的影响,并在不同的基准情景下研究了部分子簇射效应。

英文摘要:

Extending previous work on the predictions for the production of supersymmetric (SUSY) particles at the LHC, we present the fully differential calculation of the next-to-leading order (NLO) SUSY-QCD corrections to the production of squark and squark-antisquark pairs of the first two generations. The NLO cross sections are combined with the subsequent decay of the final state (anti)squarks into the lightest neutralino and (anti)quark at NLO SUSY-QCD. No assumptions on the squark masses are made, and the various subchannels are taken into account independently. In order to obtain realistic predictions for differential distributions the fixed-order calculations have to be combined with parton showers. Making use of the Powheg method we have implemented our results in the Powheg-Box framework and interfaced the NLO calculation with the parton shower Monte Carlo programs Pythia6 and Herwig++. The code is publicly available and can be downloaded from the Powheg-Box webpage. The impact of the NLO corrections on the differential distributions is studied and parton shower effects are investigated for different benchmark scenarios.

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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