论文标题
在$ \ sqrt {s} $ = 13 tev中，使用超时的无迹线喷射搜索长寿命的粒子
Search for long-lived particles using out-of-time trackless jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV
论文作者
论文摘要
搜索在CMS硅跟踪器的外部区域或量热计中的长寿命颗粒腐烂。该搜索基于$ \ sqrt {s} $ = 13 tev在2016- 2018年在LHC的CMS检测器记录的Proton-Proton碰撞的数据样本，对应于138 fb $^{ - 1} $的集成亮度。使用无轨道和超级喷射信息组合在深神网络歧视器中的一种新型技术，用于识别长寿颗粒的衰变。结果是在简化的Chargino-neutralino生产模型中解释的，其中中inino是近乎最高的超对称粒子，是长期寿命的，并且腐烂到了Gravitino，又是Higgs或Higgs或Z Boson。此搜索对中性诺最敏感的适当衰减长度约为0.5 m，在95％的置信度下，将最高1.18 TEV的质量排除在外。当前的搜索是迄今为止的最佳结果，从Higgs质量施加的运动学极限到1.8 TEV。
A search for long-lived particles decaying in the outer regions of the CMS silicon tracker or in the calorimeters is presented. The search is based on a data sample of proton-proton collisions at $\sqrt{s}$ = 13 TeV recorded with the CMS detector at the LHC in 2016-2018, corresponding to an integrated luminosity of 138 fb$^{-1}$. A novel technique, using trackless and out-of-time jet information combined in a deep neural network discriminator, is employed to identify decays of long-lived particles. The results are interpreted in a simplified model of chargino-neutralino production, where the neutralino is the next-to-lightest supersymmetric particle, is long-lived, and decays to a gravitino and either a Higgs or Z boson. This search is most sensitive to neutralino proper decay lengths of approximately 0.5 m, for which masses up to 1.18 TeV are excluded at 95% confidence level. The current search is the best result to date in the mass range from the kinematic limit imposed by the Higgs mass up to 1.8 TeV.
