论文标题
合并$ t \ bar {t}γ$和$twγ$生产的包含和差分横截面的测量值13 tev，$ e \ mkern-2muμ$通道与地图集检测器
Measurements of inclusive and differential cross-sections of combined $t\bar{t}γ$ and $tWγ$ production in the $e\mkern-2muμ$ channel at 13 TeV with the ATLAS detector
论文作者
论文摘要
与光子相关的顶级夸克的包含和差分横截面，用质子$ - $质子碰撞数据测量，对应于139 fb $^{ - 1} $的集成光度。在2015年至2018年期间，在运行2期间，Atlas检测器以13 TEV的中心能量收集了数据。测量值以在Parton级别定义的基准体积进行。选择了一个恰好具有一个光子，一个电子和一个相反符号的兆元的事件，至少有两个喷气机，其中至少一个是$ b $ tagged的。基准横截面的测量为$ 39.6 \，^{+2.7} _ { - 2.3} \，\ textrm {fb} $。将差异横截面作为几个可观察到的函数与最先进的蒙特卡洛模拟和临时领导的理论计算进行了比较。这些包括横截面作为光子运动学变量的函数，与光子和瘦素相关的角变量以及事件中两个瘦素之间的角度分离。所有测量都与标准模型的预测一致。
Inclusive and differential cross-sections for the production of top quarks in association with a photon are measured with proton$-$proton collision data corresponding to an integrated luminosity of 139 fb$^{-1}$. The data were collected by the ATLAS detector at the LHC during Run 2 between 2015 and 2018 at a centre-of-mass energy of 13 TeV. The measurements are performed in a fiducial volume defined at parton level. Events with exactly one photon, one electron and one muon of opposite sign, and at least two jets, of which at least one is $b$-tagged, are selected. The fiducial cross-section is measured to be $39.6\,^{+2.7}_{-2.3}\,\textrm{fb}$. Differential cross-sections as functions of several observables are compared with state-of-the-art Monte Carlo simulations and next-to-leading-order theoretical calculations. These include cross-sections as functions of photon kinematic variables, angular variables related to the photon and the leptons, and angular separations between the two leptons in the event. All measurements are in agreement with the predictions from the Standard Model.
