Measurement of the top quark mass in the dileptonic t t-bar decay channel using the mass observables M[bl], M[T2], and M[blnu] in pp collisions at sqrt(s) = 8 TeV
A measurement of the top quark mass (M[t]) in the dileptonic t t-bar decay channel is performed using data from proton-proton collisions at a center-of-mass energy of 8 TeV. The data was recorded by the CMS experiment at the LHC and corresponding to an integrated luminosity of 19.7 +/- 0.5 inverse femtobarns. Events are selected with two oppositely charged leptons (l = e, mu) and two jets identified as originating from b quarks. The analysis is based on three kinematic observables whose distributions are sensitive to the value of M[t]. An invariant mass observable, M[bl], and a `stransverse mass' observable, M[T2], are employed in a simultaneous fit to determine the value of M[t] and an overall jet energy scale factor (JSF). A complementary approach is used to construct an invariant mass observable, M[blnu], that is combined with M[T2] to measure M[t]. The shapes of the observables, along with their evolutions in M[t] and JSF, are modeled by a nonparametric Gaussian process regression technique. The sensitivity of the observables to the value of M[t] is investigated using a Fisher information density method. The top quark mass is measured to be 172.22 +/- 0.18 (stat) +0.89/-0.93 (syst) GeV.
First measurement of the cross section for top quark pair production with additional charm jets using dileptonic final states in pp collisions at $\sqrt{s} = $ 13 TeV
Measurement of the $b$-jet identification efficiency in dileptonic $t\bar{t}$ events using proton-proton collision data at $\sqrt{s}=13.6$ TeV collected with the ATLAS detector
EUROPEAN ORGANISATION FOR NUCLEAR RESEARCH (CERN)（欧洲核子研究中心）
A search for bottom-type vector-like quark pair production in dileptonic and fully hadronic final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV
Directly Probing the CP-structure of the Higgs-Top Yukawa at HL-LHC and Future Colliders
限制希格斯玻色子的性质是LHC计划和未来对撞机的基石。在这个Snowmass贡献，我们研究了直接探测希格斯顶部CP结构通过$t\bar{t}h$生产在HL-LHC，100 TeV FCC和μ子对撞机。我们发现在HL-LHC上，CP相（$α$）在95% CL的极限是$|α| \lesssim 36^\circ$与双轻子$t\bar t (h\to b\bar b) $和$|α| \lesssim 25^\circ$与组合$t\bar t (h\to γγ) $。100 TeV FCC使$|α| \lesssim 3^\circ$对双轻子$t\bar t (h\to b\bar b) $的灵敏度有了显著的提高，这是由于信号截面的显著增益和亮度的增加。在未来的μ子对撞机上，我们发现半轻子$t\bar t (h\to b\bar b) ν\barν$的边界分别是10 TeV的$|α| \lesssim 9^\circ$和30 TeV的$|α| \lesssim 3^\circ$。
Central-edge asymmetry as a probe of Higgs-top coupling in $t\bar{t}h$ production at LHC
Higgs-top耦合在标准模型（SM）的层次问题和真空稳定性中起着核心作用。我们提出了一种中心边缘不对称性（$A_{CE}$）来探测LHC产生$t\bar{t}h(\to b\bar{b})$的双轻子通道中CP破坏的Higgs-top耦合。我们证明了CP破坏的Higgs-top耦合可以通过扭曲$Δy_{\ell^+\ell^-}$分布来影响中心-边缘不对称性，这是由于新的顶电荷不对称项的贡献。由于$Δy_{\ell^+\ell^-}$分布与标架无关，即使在助推区也有很好的分辨力，我们采用喷流子结构技术来增强$t\bar{t}h$产生的双轻子通道的可观测性。我们发现：（1）当亮度${\cal L}=795,993,1276$ fb $^{-1}$为14 TeV时，$t\bar{t}h$产生的双轻子通道对CP相$ξ=0,π/4,π/2$的意义可达$5σ$。(2)中心-边缘不对称$A_{CE}$对$t\bar{t}h$相互作用的CP相位具有较好的分辨能力，对$ξ=0$、$π/4$、$ π/2$的分辨能力分别为-40.26\%，-26.60\%，-9.47\%，且几乎不受事件选择的影响.此外，通过对$Δy_{\ell^+\ell^-}$分布的分组- $χ^2$分析，我们发现在95% C. L. 14 TeV HL-LHC
Measurement of lepton differential distributions and the top quark mass in $t\bar{t}$ production in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
本文给出了在大型强子对撞机（LHC）ATLAS实验中记录的$\sqrt{s}=8$ TeV $pp$的20.2 fb $^{-1}$中产生的双轻子$t\bar{t}$事例的单轻子和双轻子运动学分布。绝对和归一化微分截面测量，使用事件与相反电荷$eμ$对和一个或两个$b$标记的射流。横截面的测量在一个基准区域对应的检测器接受轻子，并进行比较，从各种Monte Carlo事件发生器的预测，以及固定阶QCD计算，探索胶子部分子分布函数的灵敏度的横截面。一些分布对顶夸克极质量也很敏感; NLO固定阶预测与所有测量分布的组合拟合产生了$m_t^{\rm pole}=173.2\pm 0.9\pm0.8\pm1.2$ GeV的顶夸克质量值，其中三个不确定性来自数据统计，实验系统学和理论来源。
Search for a new pseudoscalar decaying into a pair of bottom and antibottom quarks in top-associated production in $\sqrt{s}$=13 TeV proton-proton collisions with the ATLAS detector
EUROPEAN ORGANISATION FOR NUCLEAR RESEARCH (CERN)（欧洲核子研究中心）
Search for pair and single production of vectorlike quarks in final states with at least one $Z$ boson decaying into a pair of electrons or muons in $pp$ collision data collected with the ATLAS detector at $\sqrt{s} = 13$ TeV
