论文标题
在Dilepton频道中的包含和差异$ \ MATHRM {T \ bar {t}}γ$横截面的测量以及在$ \ sqrt {s s} = $ 13 TEV的Proton-Proton碰撞中的有效现场理论解释
Measurement of the inclusive and differential $\mathrm{t\bar{t}}γ$ cross sections in the dilepton channel and effective field theory interpretation in proton-proton collisions at $\sqrt{s} =$ 13 TeV
论文作者
论文摘要
与光子相关的顶级夸克对的生产横截面在衰减通道中的质子 - 蛋白碰撞中测量，两个相对充满电的瘦素（e $^\pmμ^\ mp $，e $^+$ e $^ - $^ - $，或$μ^+μ^+μ^ - $）。使用CMS实验记录的Proton-Proton碰撞数据的138 fb $^{ - 1} $在$ \ sqrt {s} = $ 13 TEV录制的Proton-Proton碰撞数据中进行测量。定义了基准相空间，以便包括由初始状态颗粒，顶部夸克或其任何衰减产物辐射的光子。包容性的横截面为175.2 $ \ pm $ 2.5（stat）$ \ pm $ 6.3（SYST）FB在信号区域中测量，至少一个射流来自底部夸克的强壮和一个横向动量，其横向动量超过20 GEV。差异横截面被测量为光子，瘦素和喷气器的几个运动学观察者的功能，并与标准模型预测进行了比较。在标准模型有效现场理论框架中还解释了测量值，并且仅在这些结果的相关威尔逊系数上发现了限制，并结合了使用Lepton+Jets最终状态的$ \ MathRM {T \ bar {T}}γ$生产过程的$ \ MathRM {t \ bar {t}}γ$生产过程的CMS测量。
The production cross section of a top quark pair in association with a photon is measured in proton-proton collisions in the decay channel with two oppositely charged leptons (e$^\pmμ^\mp$, e$^+$e$^-$, or $μ^+μ^-$). The measurement is performed using 138 fb$^{-1}$ of proton-proton collision data recorded by the CMS experiment at $\sqrt{s} =$ 13 TeV during the 2016-2018 data-taking period of the CERN LHC. A fiducial phase space is defined such that photons radiated by initial-state particles, top quarks, or any of their decay products are included. An inclusive cross section of 175.2 $\pm$ 2.5 (stat) $\pm$ 6.3 (syst) fb is measured in a signal region with at least one jet coming from the hadronization of a bottom quark and exactly one photon with transverse momentum above 20 GeV. Differential cross sections are measured as functions of several kinematic observables of the photon, leptons, and jets, and compared to standard model predictions. The measurements are also interpreted in the standard model effective field theory framework, and limits are found on the relevant Wilson coefficients from these results alone and in combination with a previous CMS measurement of the $\mathrm{t\bar{t}}γ$ production process using the lepton+jets final state.
