论文标题
在$ \ sqrt {s} = $ 13 tev中，使用流离失所的喷气机搜索长寿命的粒子
Search for long-lived particles using displaced jets in proton-proton collisions at $\sqrt{s} = $ 13 TeV
论文作者
论文摘要
使用流离失所的喷气机提出了对长寿命颗粒的包容性搜索。该搜索在2017年和2018年使用CMS检测器收集的数据样本，该数据样本是从Proton-Proton碰撞的13 TEV中心能量中的Proton-Proton碰撞。此搜索的结果与使用CMS检测器在2016年收集的数据样本相结合，产生了132 fb $^{ - 1} $的总集成光度。该分析搜索了与Dijet系统相关的流离失所轨道和位移顶点的独特拓扑。对于一个简化的模型，其中成对生产的长寿命中性颗粒腐烂成夸克 - 易夸克对，对大于500 GEV的长寿命颗粒质量和平均适当衰减长度在2到250 mm之间的长粒子质量的置信度（CL）以95％的置信度（CL）排除在95％的置信度（CL）下。对于一个模型，标准模型的希格斯玻色子衰减到每个腐烂到夸克式的两个长寿命标量颗粒，大于1％的分支分支在95％Cl下以1 mm和340 mm之间的平均衰减长度排除在95％Cl下。还测试了一组带有成对生产的长寿命Gluinos或顶部潮湿的超对称模型，这些模型还腐烂成各种最终状态拓扑结构。 Gluino质量高达2500 GEV和最高1600 GEV的顶部尖锐质量为95％Cl，对于3至300 mm的平均衰减长度，将其排除在95％Cl中。长寿命Gluinos的质量最高质量达到2600 GEV，而长寿的高层则达到了1800 GEV。这些是这些模型迄今为止最严格的限制。
An inclusive search is presented for long-lived particles using displaced jets. The search uses a data sample collected with the CMS detector at the CERN LHC in 2017 and 2018, from proton-proton collisions at a center-of-mass energy of 13 TeV. The results of this search are combined with those of a previous search using a data sample collected with the CMS detector in 2016, yielding a total integrated luminosity of 132 fb$^{-1}$. The analysis searches for the distinctive topology of displaced tracks and displaced vertices associated with a dijet system. For a simplified model, where pair-produced long-lived neutral particles decay into quark-antiquark pairs, pair production cross sections larger than 0.07 fb are excluded at 95% confidence level (CL) for long-lived particle masses larger than 500 GeV and mean proper decay lengths between 2 and 250 mm. For a model where the standard model-like Higgs boson decays to two long-lived scalar particles that each decays to a quark-antiquark pair, branching fractions larger than 1% are excluded at 95% CL for mean proper decay lengths between 1 mm and 340 mm. A group of supersymmetric models with pair-produced long-lived gluinos or top squarks decaying into various final-state topologies containing displaced jets is also tested. Gluino masses up to 2500 GeV and top squark masses up to 1600 GeV are excluded at 95% CL for mean proper decay lengths between 3 and 300 mm. The highest lower bounds on mass reach 2600 GeV for long-lived gluinos and 1800 GeV for long-lived top squarks. These are the most stringent limits to date on these models.
