Lindert J M, Pozzorini S, Boughezal R, Campbell J M, Denner A, Dittmaier S, Gehrmann-De Ridder A, Gehrmann T, Glover N, Huss A, Kallweit S, Maierhöfer P, Mangano M L, Morgan T A, Mück A, Petriello F, Salam G P, Schönherr M, Williams C
1Department of Physics, Institute for Particle Physics Phenomenology, University of Durham, Durham, DH1 3LE UK.
2Physik-Institut, Universität Zürich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.
Eur Phys J C Part Fields. 2017;77(12):829. doi: 10.1140/epjc/s10052-017-5389-1. Epub 2017 Dec 5.
High-energy jets recoiling against missing transverse energy (MET) are powerful probes of dark matter at the LHC. Searches based on large MET signatures require a precise control of the jet background in the signal region. This can be achieved by taking accurate data in control regions dominated by jet, jet and jet production, and extrapolating to the jet background by means of precise theoretical predictions. In this context, recent advances in perturbative calculations open the door to significant sensitivity improvements in dark matter searches. In this spirit, we present a combination of state-of-the-art calculations for all relevant jets processes, including throughout NNLO QCD corrections and NLO electroweak corrections supplemented by Sudakov logarithms at two loops. Predictions at parton level are provided together with detailed recommendations for their usage in experimental analyses based on the reweighting of Monte Carlo samples. Particular attention is devoted to the estimate of theoretical uncertainties in the framework of dark matter searches, where subtle aspects such as correlations across different jet processes play a key role. The anticipated theoretical uncertainty in the jet background is at the few percent level up to the TeV range.
在大型强子对撞机（LHC）上，与横向缺失能量（MET）反冲的高能喷注是暗物质的有力探测手段。基于大型MET特征的搜索需要精确控制信号区域中的喷注背景。这可以通过在以单喷注、双喷注和三喷注产生为主的控制区域获取准确数据，并借助精确的理论预测外推到单喷注背景来实现。在此背景下，微扰计算的最新进展为暗物质搜索中的显著灵敏度提升打开了大门。本着这种精神，我们给出了所有相关单喷注过程的最新计算结果，包括完整的NNLO QCD修正和NLO电弱修正，并补充了两圈的Sudakov对数。给出了部分子水平的预测结果以及基于蒙特卡罗样本重加权在实验分析中使用它们的详细建议。特别关注暗物质搜索框架中理论不确定性的估计，其中不同单喷注过程之间的相关性等微妙方面起着关键作用。单喷注背景中预期的理论不确定性在高达TeV范围时处于百分之几的水平。
