arXiv 1908.055022019-08-15hep-ex

ATLAS的顶夸克性质

Top-quark properties at ATLAS

Markus Cristinziani

备注：: 9 pages, 4 figures, contribution to the proceedings of the Seventh Annual Conference on Large Hadron Collider Physics (LHCP2019)
发表信息：: PoS (LHCP2019) 142

摘要：

介绍了顶夸克的性质，重点是最新的ATLAS质量测量和$t\bar{t}$自旋相关，这些测量是通过大型强子对撞机收集的质子-质子碰撞数据获得的。在这两种情况下都使用了归一化微分分布。对于顶夸克质量的提取，从20.2 fb $^{-1}$ 8 TeV数据集中选取$t\bar{t}+1$喷流单轻子事例，将部分子水平的展开分布与理论预测进行比较，得到了极质量方案中的$m_t^{\text{pole}} = 171.1^{+1.2}_{-1.1}$ GeV和运行质量方案中的$m_t(m_t) = 162.9^{+2.4}_{-1.6}$ GeV.为了测量$t\bar{t}$产生过程中的自旋关联，我们用36.1 fb $^{-1}$ 13 TeV的数据选择了双轻子事例。两个轻子之间的方位开度角是作为$t\bar{t}$系统不变质量的函数测量的。所观察到的自旋相关程度是显着高于预测所使用的发电机，但同意与预测的固定阶计算之一。

英文摘要：

Properties of the top-quark are presented, with emphasis on the most recent ATLAS measurements of the mass and $t\bar{t}$ spin correlations, obtained with proton-proton collision data collected at the Large Hadron Collider. Normalised differential distributions are used in both cases. For the extraction of the top-quark mass, $t\bar{t}+1$-jet single-lepton events are selected from the 20.2 fb$^{-1}$ 8 TeV dataset, and the unfolded distribution at parton level is compared with theoretical predictions to obtain $m_t^{\text{pole}} = 171.1^{+1.2}_{-1.1}$ GeV in the pole-mass scheme and $m_t(m_t) = 162.9^{+2.4}_{-1.6}$ GeV in the running-mass scheme. For the measurement of spin correlations in $t\bar{t}$ production, dilepton events are selected using 36.1 fb$^{-1}$ 13 TeV data. The azimuthal opening angle between the two leptons is measured inclusively and as a function of the invariant mass of the $t\bar{t}$ system. The observed degree of spin correlation is significantly higher than predicted by the generators used, but agrees well with the prediction of one of the fixed-order calculations.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文