Search for $t\bar tH/A \rightarrow t\bar tt\bar t$ production in the multilepton final state in proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
A search for a new heavy scalar or pseudo-scalar Higgs boson ($H/A$) produced in association with a pair of top quarks, with the Higgs boson decaying into a pair of top quarks ($H/A\rightarrow t\bar{t}$) is reported. The search targets a final state with exactly two leptons with same-sign electric charges or at least three leptons. The analysed dataset corresponds to an integrated luminosity of 139 fb$^{-1}$ of proton-proton collisions collected at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC. Two multivariate classifiers are used to separate the signal from the background. No significant excess of events over the Standard Model expectation is observed. The results are interpreted in the context of a type-II two-Higgs-doublet model. The observed (expected) upper limits at 95% confidence level on the $t\bar{t}H/A$ production cross-section times the branching ratio of $H/A\rightarrow t\bar{t}$ range between 14 (10) fb and 6 (5) fb for a heavy Higgs boson with mass between 400 GeV and 1000 GeV, respectively. Assuming that only one particle, either the scalar $H$ or the pseudo-scalar $A$, contributes to the $t\bar{t}t\bar{t}$ final state, values of $\tanβ$ below 1.2 or 0.5 are excluded for a mass of 400 GeV or 1000 GeV, respectively. These exclusion ranges increase to $\tanβ$ below 1.6 or 0.6 when both particles are considered.
Measurement of the $t\bar{t}Z$ and $t\bar{t}W$ production cross sections in multilepton final states using 3.2 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
Search for Beyond the Standard Model physics with anomaly detection in multilepton final states in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
EUROPEAN ORGANISATION FOR NUCLEAR RESEARCH (CERN)（欧洲核子研究中心（CERN））
Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t \to Hu$ in multilepton final states in proton-proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector
Measurement of the Higgs boson production in association with top quarks in multilepton final states in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
Search for singly produced vector-like top partners in multilepton final states with 139 $\mathrm{fb}^{-1}$ of $pp$ collision data at $\sqrt{s} = 13$ TeV with the ATLAS detector
A search for electroweak $t\bar{t}Wj$ production in multileptonic final states at $\sqrt{s} = 13$ TeV with the ATLAS detector and bounds on effective field theory operators
EUROPEAN ORGANISATION FOR NUCLEAR RESEARCH (CERN)（欧洲核子研究组织（CERN））
Measurement of the Higgs boson mass in the $H\rightarrow ZZ^* \rightarrow 4\ell$ and $H \rightarrow γγ$ channels with $\sqrt{s}=13$ TeV $pp$ collisions using the ATLAS detector
Topping-up multilepton plus b-jets anomalies at the LHC with a $Z'$ boson
在过去的几年中，ATLAS和CMS报告了在$t\bar t H$、$t\bar t W^\pm$、$t\bar t Z$和$t\bar t t\bar t$等分析中，多重轻子加上$b$ -喷流的特征的一些轻微到轻微的差异。其中，最近ATLAS关于$t\bar t H$产生的结果也报道了具有两个或更多$b$标记喷流的同号双轻子通道中的电荷不对称性。受这些诱人的差异的启发，我们研究了一个唯象的新物理模型，该模型由一个通过右手流耦合到上型夸克的$Z'$玻色子组成：$t_Rγ^μ\bar t_R$，$t_Rγ^μ\bar c_R$和$t_R γ^μ\bar u_R$。后一个顶点允许将LHC初始状态质子的电荷不对称性转化为顶夸克的最终状态，顶夸克衰变为正轻子和$b$ -喷流，为观察到的一些差异提供了至关重要的贡献。通过在检测器水平上的分析，我们选择了我们的模型的参数空间中的区域，该区域最好地再现了上述$t\bar t H$研究和最近的ATLAS $t\bar t t \bar t$搜索中的数据。我们发现，我们的模型提供了一个更好的拟合实验数据比标准模型的新物理尺度约$\sim$ 500 GeV，并与分层耦合的$Z'$玻色子，有利于顶夸克和FCNC电流的存在。为了估计LHC对该信号的灵敏度，我们设计了一个宽带搜索，其特征在于具有不同信号背景比的许多运动区域，并进行全局分析。我们还定义了信号增强…
Measurement of the Higgs boson mass from the $H\rightarrow γγ$ and $H \rightarrow ZZ^{*} \rightarrow 4\ell$ channels with the ATLAS detector using 25 fb$^{-1}$ of $pp$ collision data
Measurements of the Total and Differential Higgs Boson Production Cross Sections Combining the $H \rightarrow γγ$ and $H \rightarrow ZZ ^{*}\rightarrow 4\ell$ Decay Channels at $\sqrt{s}=8$ TeV with the ATLAS Detector
Combined measurement of differential and total cross sections in the $H \rightarrow γγ$ and the $H \rightarrow ZZ^* \rightarrow 4\ell$ decay channels at $\sqrt{s} = 13$ TeV with the ATLAS detector
Measurement of the production cross section for a Higgs boson in association with a vector boson in the $H \rightarrow WW^{\ast} \rightarrow \ellν\ellν$ channel in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
Measurement of the energy response of the ATLAS calorimeter to charged pions from $W^{\pm}\rightarrowτ^{\pm}(\rightarrowπ^{\pm}ν_τ)ν_τ$ events in Run 2 data
Measurement of inclusive and differential cross sections in the $H \rightarrow ZZ^* \rightarrow 4\ell$ decay channel in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
Measurement of the Higgs boson coupling properties in the $H\rightarrow ZZ^{*} \rightarrow 4\ell$ decay channel at $\sqrt{s}$ = 13 TeV with the ATLAS detector
Search for a new $Z'$ gauge boson via the $pp \rightarrow W^{\pm(*)} \rightarrow Z' μ^{\pm} ν\rightarrow μ^{\pm}μ^{\mp}μ^{\pm}ν$ process in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
Measurement of fiducial differential cross sections of gluon-fusion production of Higgs bosons decaying to $WW^{\ast}{\rightarrow\,}eνμν$ with the ATLAS detector at $\sqrt{s}=8$ TeV
Measurement of exclusive $γγ\rightarrow W^+W^-$ production and search for exclusive Higgs boson production in $pp$ collisions at $\sqrt{s} = 8$ TeV using the ATLAS detector
Measurements of Higgs boson production via gluon-gluon fusion and vector-boson fusion using $H\rightarrow WW^\ast \rightarrow \ellν\ellν$ decays in $pp$ collisions with the ATLAS detector and their effective field theory interpretations
EUROPEAN ORGANISATION FOR NUCLEAR RESEARCH (CERN)（欧洲核子研究中心）
Search for chargino and neutralino production in final states with a Higgs boson and missing transverse momentum at $\sqrt{s} = 13$ TeV with the ATLAS detector
Measurement of the total and differential Higgs boson production cross-sections at $\sqrt{s} = 13$ TeV with the ATLAS detector by combining the $H \rightarrow ZZ^* \rightarrow 4\ell$ and $H \rightarrow γγ$ decay channels
Search for charged Higgs bosons produced in association with a top quark and decaying via $H^{\pm} \rightarrow τν$ using $pp$ collision data recorded at $\sqrt{s} = 13$ TeV by the ATLAS detector
Measurements of Higgs boson production by gluon-gluon fusion and vector-boson fusion using $H\rightarrow W W^* \rightarrow eνμν$ decays in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
Search for the Higgs boson produced in association with a vector boson and decaying into two spin-zero particles in the $H \rightarrow aa \rightarrow 4b$ channel in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
Constraints on non-Standard Model Higgs boson interactions in an effective Lagrangian using differential cross sections measured in the $H \rightarrow γγ$ decay channel at $\sqrt{s} = 8$ TeV with the ATLAS detector
Integrated and differential fiducial cross-section measurements for the vector boson fusion production of the Higgs boson in the $H \rightarrow WW^{\ast}\rightarrow eνμν$ decay channel at 13 $\text{TeV}$ with the ATLAS detector
利用 ATLAS 的 13 TeV Run 2 数据，在 $H\to WW^*\to eνμν$ 道测量 VBF 希格斯产生的积分与微分基准截面，并用于约束 EFT 六维算符。
Measurement of the cross section of high transverse momentum $Z\rightarrow b\bar{b}$ production in proton--proton collisions at $\sqrt{s}=8 TeV$ with the ATLAS Detector
Search for four-top-quark production in the single-lepton and opposite-sign dilepton final states in pp collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
