论文标题
搜索$ t \ bar {t} $在$ \ sqrt {s} = 13 $ tev with atla
Search for $t\bar{t}$ resonances in fully hadronic final states in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
论文作者
论文摘要
本文使用139 fb $^{ - 1} $的质子 - 普罗顿碰撞数据搜索新的重颗粒，以$ \ sqrt {s} = 13 $ tev录制的质子 - 普罗顿碰撞数据的139 fb $^{ - 1} $，与大型Hadron Collider的Atlas检测器一起记录。搜索是使用与高透明摩托明夸克的一对生产一致的事件进行的，然后将其随后的衰减到完全悬浮的最终状态中。该分析已优化，可通过质量高于1.4 tev的质量衰减，以衰减成$ t \ bar {t} $对，利用具有JET子结构的专用多元技术，以使用大型-Radius Jets识别强发化的顶级Quarks，并从数据中评估了背景期望。没有观察到与背景预测的显着偏差。限制是针对新的$ z'$ boson的生产横截面分支分数，其中具有冠状辅助型技术型号。 $ Z'Ub -Boson块以下3.9和4.7 TEV的衰减宽度分别为1％和3％的置信度。
This paper presents a search for new heavy particles decaying into a pair of top quarks using 139 fb$^{-1}$ of proton--proton collision data recorded at a centre-of-mass energy of $\sqrt{s}=13$ TeV with the ATLAS detector at the Large Hadron Collider. The search is performed using events consistent with pair production of high-transverse-momentum top quarks and their subsequent decays into the fully hadronic final states. The analysis is optimized for resonances decaying into a $t\bar{t}$ pair with mass above 1.4 TeV, exploiting a dedicated multivariate technique with jet substructure to identify hadronically decaying top quarks using large-radius jets and evaluating the background expectation from data. No significant deviation from the background prediction is observed. Limits are set on the production cross-section times branching fraction for the new $Z'$ boson in a topcolor-assisted-technicolor model. The $Z'$ boson masses below 3.9 and 4.7 TeV are excluded at 95% confidence level for the decay widths of 1% and 3%, respectively.
