论文标题
使用13 tev $ pp $碰撞与地图集检测器搜索希格斯玻色子异国腐烂产生的流离失所的光子
Search for displaced photons produced in exotic decays of the Higgs boson using 13 TeV $pp$ collisions with the ATLAS detector
论文作者
论文摘要
搜索是针对来自中性长寿命（LLP）的流离失所衰减的延迟和非点光子的搜索。该分析使用LHC在2015年至2018年之间的$ \ sqrt {s} = 13 $ TEV的全部运行2个数据集的质子 - 普罗顿碰撞碰撞，并由Atlas检测器记录，对应于139 fb $^{ - 1} $的综合亮度。地图集电磁骑热计的能力被利用以精确测量光子的到达时间和轨迹。在125 GEV Higgs玻色子的外来衰减中，LLP是成对产生的情况，其结果是解释的，随后每个LLP随后腐烂到光子和一个逃避直接检测的粒子，从而导致缺失的横向动量。由于标准模型背景过程，没有观察到高于预期的显着过多。结果用于设置希格斯玻色子外来衰变的分支比率的上限。与模型无关的极限还设置为具有较大位移和时间延迟值的光子的生产。
A search is performed for delayed and nonpointing photons originating from the displaced decay of a neutral long-lived particle (LLP). The analysis uses the full Run 2 data set of proton-proton collisions delivered by the LHC at a center-of-mass energy of $\sqrt{s}=13$ TeV between 2015 and 2018 and recorded by the ATLAS detector, corresponding to an integrated luminosity of 139 fb$^{-1}$. The capabilities of the ATLAS electromagnetic calorimeter are exploited to precisely measure the arrival times and trajectories of photons. The results are interpreted in a scenario where the LLPs are pair-produced in exotic decays of the 125 GeV Higgs boson, and each LLP subsequently decays into a photon and a particle that escapes direct detection, giving rise to missing transverse momentum. No significant excess is observed above the expectation due to Standard Model background processes. The results are used to set upper limits on the branching ratio of the exotic decay of the Higgs boson. A model-independent limit is also set on the production of photons with large values of displacement and time delay.
