论文标题
观察$ \ sqrt {s} = 13 $ tev the Atlas检测器
Observation of the associated production of a top quark and a $Z$ boson in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
论文作者
论文摘要
在Trilepton频道中测量了与$ Z $ Boson联合的单夸克生产。使用了2015年至2018年Atlas实验收集的质子 - 普罗顿碰撞数据，以13 tev的质量能量为13 tev，对应于139 $ \ text {fb}^{ - 1} $的集成光度。选择了包含三个隔离带电的瘦素（电子或哑光）和两个或三个喷气机的事件，其中之一被确定为包含$ b $ hadron的事件。主要背景来自$ t \ bar {t} Z $和Diboson生产。神经网络用于改善背景排斥并提取信号。 $ t \ ell^{+} \ ell^{ - } Q $生产的测量横截面，包括非共振DILEPTON与$ M _ {\ ell^+\ ell^ - }> 30 $ GEV，是97 $ \ $ \ $ \ $ \ $ \ $ \ $ \ $ \ $ \ pm 13（stat。
Single top-quark production in association with a $Z$ boson is measured in the trilepton channel. The proton-proton collision data collected by the ATLAS experiment from 2015 to 2018 at a centre-of-mass energy of 13 TeV are used, corresponding to an integrated luminosity of 139 $\text{fb}^{-1}$. Events containing three isolated charged leptons (electrons or muons) and two or three jets, one of which is identified as containing a $b$-hadron, are selected. The main backgrounds are from $t\bar{t}Z$ and diboson production. Neural networks are used to improve the background rejection and extract the signal. The measured cross-section for $t\ell^{+}\ell^{-} q$ production, including non-resonant dilepton pairs with $m_{\ell^+\ell^-} > 30$ GeV, is 97 $\pm$ 13 (stat.) $\pm$ 7 (syst.) fb, consistent with the Standard Model prediction.
