论文标题
与ATLAS实验相关的光子生产中电荷不对称的测量
Measurement of the charge asymmetry in top-quark pair production in association with a photon with the ATLAS experiment
论文作者
论文摘要
提出了与光子相关的Top-quark对（$ t \ bar {t} $）中电荷不对称的测量。该测量在单级$ t \ bar {t} $衰减通道中使用质子 - 普罗顿碰撞数据在2015 - 2018年期间与13 tev的质量质量增强的大型强子碰撞器中收集的质子 - 普罗顿碰撞数据，在2015-2018年度为13 tev，对应于139 fb $ $ $^^$ 139 fb $^^$^139 fb $^^{{{{in。电荷不对称是通过使用轮廓可能性展开方法的顶部夸克和古夸克的绝对速度差异的分布获得的。与标准模型期望一致，它被衡量为$ a_ \ text {c} = -0.003 \ pm 0.029 $。
A measurement of the charge asymmetry in top-quark pair ($t\bar{t}$) production in association with a photon is presented. The measurement is performed in the single-lepton $t\bar{t}$ decay channel using proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider at CERN at a centre-of-mass-energy of 13 TeV during the years 2015-2018, corresponding to an integrated luminosity of 139 fb$^{-1}$. The charge asymmetry is obtained from the distribution of the difference of the absolute rapidities of the top quark and antiquark using a profile likelihood unfolding approach. It is measured to be $A_\text{C}=-0.003 \pm 0.029$ in agreement with the Standard Model expectation.
