论文标题
在$ \ sqrt {s} = $ 13 tev中搜索质子 - 普罗顿碰撞中的消失曲目
Search for disappearing tracks in proton-proton collisions at $\sqrt{s} =$ 13 TeV
论文作者
论文摘要
搜索搜索在CMS实验的硅跟踪器体积中衰减的长寿命带电颗粒。这样的颗粒可以产生带有孤立轨道的事件，该事件在硅跟踪器的最外层中缺少命中，并且也与沉积在量热计中的能量很少，并且在muon探测器中没有命中。在CMS实验记录的LHC记录的Proton-Proton碰撞样本中，搜索事件具有该“消失的轨道”签名，其质量中心能量为13 TEV，对应于101 fb $^{ - 1} $ 101 fb $^{ - 1} $ 2017和2018年记录的综合亮度。48个事件的观察。 $ _ { - 2.3}^{+2.7} $（stat）$ \ pm $ 8.1（SYST）事件。在纯粹的Wino和Higgsino Neutmorino场景的异常介导的超对称性模型的背景下，chargino生产上的上限设置为上限。在95％的置信度下，第一个约束是在Higgsino案例中放置在Chargino质量上的，在3（0.05）ns的寿命中不包括750（175）GEV以下的GEV。在Wino情况下，该搜索的结果与先前的CMS搜索结合在一起，以产生代表2015 - 2018年记录的完整LHC数据集的结果，这是迄今为止最严格的约束。在95％的置信水平下，Wino案例中的Chargino质量在3（474）GEV的寿命为3（0.2）Ns的情况下排除在884（474）中。
A search is presented for long-lived charged particles that decay within the volume of the silicon tracker of the CMS experiment. Such particles can produce events with an isolated track that is missing hits in the outermost layers of the silicon tracker, and is also associated with little energy deposited in the calorimeters and no hits in the muon detectors. The search for events with this "disappearing track" signature is performed in a sample of proton-proton collisions recorded by the CMS experiment at the LHC with a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 101 fb$^{-1}$ recorded in 2017 and 2018. The observation of 48 events is consistent with the estimated background of 47.8 $_{-2.3}^{+2.7}$ (stat) $\pm$ 8.1 (syst) events. Upper limits are set on chargino production in the context of an anomaly-mediated supersymmetry breaking model for purely wino and higgsino neutralino scenarios. At 95% confidence level, the first constraint is placed on chargino masses in the higgsino case, excluding below 750 (175) GeV for a lifetime of 3 (0.05) ns. In the wino case, the results of this search are combined with a previous CMS search to produce a result representing the complete LHC data set recorded in 2015-2018, the most stringent constraints to date. At 95% confidence level, chargino masses in the wino case are excluded below 884 (474) GeV for a lifetime of 3 (0.2) ns.
