NLO QCD+EW predictions for V + jets including off-shell vector-boson decays and multijet merging
NLO QCD+EW predictions for V + jets including off-shell vector-boson decays and multijet merging
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DOI：
10.1007/jhep04(2016)021
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发表时间：
2015-11
影响因子：
5.4
通讯作者：
S. Kallweit;J. Lindert;S. Pozzorini;M. Schonherr;P. Maierhofer
中科院分区：
文献类型：
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作者：
S. Kallweit;J. Lindert;S. Pozzorini;M. Schonherr;P. Maierhofer
我们提出了次领先阶（NLO）的预测，包括QCD和电弱（EW）的生产和衰变的离壳电弱矢量玻色子在13 TeV的LHC与多达两个喷气机的修正。所有可能的双轻子的最终状态与零，一个或两个带电轻子，可以产生的离壳W和Z玻色子或光子被认为是。所有的预测得到使用的非线性光学QCD + EW校正的O笔环矩阵元素生成器结合慕尼黑和夏尔巴蒙特卡罗框架的自动执行。电弱校正在BSM搜索的背景下发挥了特别重要的作用，由于存在大EW Sudakov的TeV尺度的粒子。在这个运动学制度，重要的观测，如喷流的横向动量或总的横向能量是强烈敏感的多喷流排放。因此，固定阶NLO QCD + EW预测受到巨大QCD修正和较差理论精度的困扰。为了解决这个问题，我们提出了一个近似的方法，允许一个简单而可靠的实施NLO EW校正的MePs@NLO multijet合并框架。使用这种一般的方法，我们提出了一个包容性的模拟矢量玻色子生产与喷气机，保证非线性光学QCD + EW的准确性，在所有的相空间区域，涉及到两个解决的喷气机。
We present next-to-leading order (NLO) predictions including QCD and electroweak (EW) corrections for the production and decay of off-shell electroweak vector bosons in association with up to two jets at the 13 TeV LHC. All possible dilepton final states with zero, one or two charged leptons that can arise from off-shell W and Z bosons or photons are considered. All predictions are obtained using the automated implementation of NLO QCD+ EW corrections in the O pen Loops matrix-element generator combined with the Munich and Sherpa Monte Carlo frameworks. Electroweak corrections play an especially important role in the context of BSM searches, due to the presence of large EW Sudakov logarithms at the TeV scale. In this kinematic regime, important observables such as the jet transverse momentum or the total transverse energy are strongly sensitive to multijet emissions. As a result, fixed-order NLO QCD+ EW predictions are plagued by huge QCD corrections and poor theoretical precision. To remedy this problem we present an approximate method that allows for a simple and reliable implementation of NLO EW corrections in the MePs@ Nlo multijet merging framework. Using this general approach we present an inclusive simulation of vector-boson production in association with jets that guarantees NLO QCD+ EW accuracy in all phase-space regions involving up to two resolved jets.