论文标题
重新平衡和涂片以进行多射流背景估计
Rebalance and Smear for Multi-jet Background Estimation
论文作者
论文摘要
对于许多粒子对撞机的搜索，在最终状态和缺失横向动量的最终状态下，对物理进行了搜索，QCD多重生过程的事件是重要且具有挑战性的背景贡献。 CMS和ATLAS实验先前已经开发了数据驱动的方法，旨在在蒙特卡洛方法遭受大型理论和实验性不确定性的情况下取得成功。一种这样的方法是重新平衡和涂片（R＆S），它通过将一系列折叠和展开技术应用于数据控制区域来预测QCD背景。介绍了R＆S方法的自上而下描述，并讨论了其适用性和局限性。提供了使用公共，非专有工具执行R \＆S方法的软件应用程序，并与Delphes3生产的数据集进行了交流。通常，该方法适用于预测搜索稳定的不可检测颗粒（例如候选暗物质的颗粒）的多喷射背景。在质子质子碰撞的模拟事件中，在14 TEV的模拟事件中进行了案例研究，这是在潜在地搜索超对称夸克伙伴的衰减产物中产生的higgsino暗物质的背景下进行的。探索了潜在偏见的来源，并提出了用于评估系统不确定性的处方。
For many particle collider searches for physics beyond the Standard Model in final states with jets and missing transverse momentum, events from QCD multi-jet processes are an important and challenging background contribution. The CMS and ATLAS experiments have previously developed data-driven methods designed to succeed where Monte Carlo methods suffer large theoretical and experimental uncertainties. One such method is Rebalance and Smear (R&S), which predicts QCD backgrounds by applying a series of folding and unfolding techniques to data control regions. A top-to-bottom description of the R&S method is presented, along with a discussion of its applicability and limitations. A software application is provided that performs the R\&S method using public, non-proprietary tools, interfacing with data sets produced by Delphes3. In general, the method is suitable for predicting multi-jet backgrounds in searches for stable non-detectable particles, such as dark matter candidates. A case study is carried out in simulated events of proton-proton collisions at 14 TeV in the context of a potential search for Higgsino dark matter produced in the decay products of supersymmetric quark partners. Sources of potential bias are explored and prescriptions for evaluating systematic uncertainties are suggested.
