Search for $t\bar{t}$ resonances with the ATLAS detector
E. V. Khramov, A. Tonoyan, V. A. Bednyakov, N. A. Rusakovich
由于违反了ATLAS实验出版政策，该论文已被作者撤回。
This paper has been withdrawn by the authors due to the violation of ATLAS experiment publication policy.
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Recent results from the proton-proton collision data taken by the ATLAS experiment on exotic resonances are presented. A search for $J/ψp$ resonances in $Λ_{b}\rightarrow J/ψp K$ decays with large $p K$ invariant masses is reported. A search for exotic resonances in the four-muon final state is shown.
Searches for resonances in final states with leptons and photons have always been a powerful tool for discovery in high energy physics. We present here the latest results from the ATLAS and CMS experiments, based on up to 36.1 fb$^{-1}$ of 13 TeV proton-proton collisions produced at the Large Hadron Collider. Detailed results on single lepton, dilepton, diphoton and Z$γ$ resonances are included.
High Mass Resonances at ATLAS
一个简短的概述搜索高质量共振使用的ATLAS实验在2011年LHC运行期间收集的数据的子集。各种最终状态，包括双轻子，双光子，轻子与失踪的横向能量，双喷气，光子与喷气，顶部反顶部对，和Z玻色子对进行了探讨。没有发现新的共振，并限制了几个新的物理模型。
Searches for high mass dilepton resonances in pp collisions at sqrt(s) = 7 TeV with the ATLAS Experiment
ATLAS探测器已被用于寻找高质量的ee或mumu共振，如新的重中性规范玻色子。ATLAS实验记录的s = 7 TeV的质子-质子碰撞超过1 fb^{-1}，用于寻找衰变为双轻子对的高质量态。没有观察到超过标准模型预期的情况，并且对预测自旋1和自旋2共振的基准模型施加了限制。
Discovery Potential for Di-lepton and Lepton+Etmiss Resonances at High Mass with ATLAS
本文介绍了新的共振与ATLAS实验的发现潜力。这里讨论的共振是Z '，leptoquark，引力子和W'共振在它们的一些轻子末态，考虑到所有这些的质心能量为14 TeV，并估计在LHC的早期质心能量的W'搜索的潜力。研究的方案表明，在大多数这些模型中，几十个1/pb的初始运行就足以超过当前的限制。
Many models beyond the standard model predict the existence of vector-like quarks or other types of heavy resonances. Using proton-proton collision data at center-of-mass energies of 8 and 13 TeV, the ATLAS and CMS Collaborations have performed a multitude of searches for pair and singly produced vector-like quarks decaying to W, Z, or Higgs bosons. Heavy gauge and (pseudo)scalar resonances decaying to top quarks have been searched for as well. No evidence for any of these hypothetical particles has been found yet, and stringent exclusion limits are derived on their masses, cross sections and …
Searches for high-mass resonances decaying to pairs of standard model bosons using ATLAS and CMS detectors are presented. The searches use 15 - 36 $\textrm{fb}^{-1}$ of proton-proton collision data collected at the centre-of-mass energy of 13 TeV at the LHC. Many different final states have been considered and the results are interpreted in a range of theories beyond the standard model of particle physics, most common being heavy vector triplet and warped extra dimensions.
A search for new spin-0 resonances decaying into two photons in the ATLAS experiment at the LHC is described. The analysis is based on $pp$ collision data at $\sqrt{s}$=13 TeV corresponding to integrated luminosities of 3.2/fb and 12.2/fb recorded in 2015 and 2016, respectively. A deviation from the Standard Model background-only hypothesis corresponding to 3.4 standard deviations is observed in the 2015 data for a resonance mass hypothesis of 730 GeV. No significant excess at such mass over the background expectation is observed in the 2016 data. Limits on the production cross section times b…
Search for high-mass dilepton resonances with the ATLAS experiment at sqrt(s) = 7 TeV
我们提出了一个搜索的高质量的l+l-共振PP碰撞在一个中心的质量能量为7 TeV的ATLAS实验在2011年记录。在对应于约1/fb的积分亮度的数据集中，没有观察到统计学上显著超过标准模型预期的情况。因此，上限被设置在作为共振质量的函数的衰减到μ子对的共振的横截面时间分支比上。特别地，当质量低于1.83 TeV时，不考虑序贯标准模型Z'，当质量低于1.63 TeV时，不考虑耦合k/M_P_l = 0.1的Randall-Sundrum-Kaluza-Klein引力子。
Prospects for early top anti-top resonance searches in ATLAS
在大型强子对撞机的顶反顶事件中寻找新物理学的特征需要有效地重建具有宽范围横动量的顶夸克。三个新的重建计划，以处理各种各样的顶部衰变拓扑结构。轻子+喷流的最终状态的性能进行了评估，使用详细的模拟信号和背景过程。与以前的ATLAS研究相比，一个大大提高了重建效率被发现在一个大的顶部对顶部不变的质量范围。因此，即使在实验的最早阶段，ATLAS也有望大大扩展现有搜索的大规模范围。
A Search for ttbar Resonances in the Dilepton Channel in 1.04 fb^-1 of pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment
本文介绍了在LHC上寻找sqrt（s）= 7 TeV pp碰撞中的高质量ttbar共振。我们使用顶夸克的$W$玻色子衰变为电子或μ子（双轻子终态）的终态来寻找这样的共振。这些数据由ATLAS实验在2011年记录，对应的总积分亮度为L = 1.04 fb^-1。未观察到统计学显著性超出标准模型预期。95%置信水平下的上限（C.L.）设置在谐振衰减到TTBAR对的横截面乘以分支比上，作为谐振质量的函数。在Randall-Sundrum模型中，对于Kaluza-Klein胶子共振的情况，我们设定了0.84TeV的质量下限。
Searches for new resonances in the diphoton final state, with spin 0 as predicted by theories with an extended Higgs sector and with spin 2 using a warped extra-dimension benchmark model, are presented using 139 fb$^{-1}$ of $\sqrt{s} = $ 13 TeV $pp$ collision data collected by the ATLAS experiment at the LHC. No significant deviation from the Standard Model is observed and upper limits are placed on the production cross-section times branching ratio to two photons as a function of the resonance mass.
Search for high mass dilepton resonances in pp collisions at sqrt{s}=7 TeV with the ATLAS experiment
本文介绍了在LHC上寻找sqrt{s} = 7 TeV pp碰撞中的高质量e e或mu mu共振。这些数据由ATLAS实验在2010年记录，对应的总积分亮度约为40/pb。在110 GeV以上的双轻子不变质量的搜索区域中，没有观察到统计上显著超过标准模型预期的过量。在95%置信水平下的上限被设置在Z'共振衰减为双电子和双μ子的横截面时间分支比上，作为共振质量的函数。导出了序贯标准模型Z'玻色子的质量下限为1.048 TeV，以及Z* 和E（6）激发Z'玻色子的质量下限。
A search for high-mass resonances decaying to tau+tau- in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
这封信提出了一个搜索的高质量共振衰减到tau+tau最终状态使用质子-质子碰撞在sqrt（s）= 7 TeV的大型强子对撞机产生的。用ATLAS检测器记录数据，并对应于4.6毫微微粒子的积分亮度。没有观察到统计学上显著超过标准模型预期;在衰减成tau+tau对的Z'共振的截面倍分支分数上设置95%可信度上限，作为共振质量的函数。结果表明，在95%的可信度下，序列标准模型中质量小于1.40 TeV的Z'玻色子被排除在外。
Searches for vector-like quarks and $t\bar{t}$ resonances are performed with the ATLAS experiment at the Large Hadron Collider using an integrated luminosity of 14.3~fb$^{-1}$ of proton-proton collisions recorded in 2012 at a center-of-mass energy of $\sqrt{s} = $ 8~TeV. Several final states have been exploited to carry out these searches such as lepton plus jets and opposite and same-sign dilepton final states. No significant excess of events above the Standard Model expectation is observed, and upper limits at 95$\%$ CL are derived for vector-like quarks of various masses in a two-dimensiona…
Search for dilepton resonances in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
这封信报道了对衰减到双轻子末态的窄高质量共振的研究。这些数据是由ATLAS实验记录的pp碰撞在sqrt（s）= 7 TeV的大型强子对撞机和对应的总积分亮度的1.08/fb（1.21/fb）的ee（mumu）通道。未观察到统计学显著性超出标准模型预期，上限设定为95% C. L。研究了Z'共振态的横截面倍分支比和Randall-Sundrum引力子衰变为双轻子的过程与共振质量的关系。序列标准模型Z'玻色子的质量下限为1.83 TeV。在95% C. L处，不存在耦合系数k/M_P_l =0.1的Randall-Sundrum引力子。质量低于1.63 TeV。
A search for resonances in the dielectron and dimuon mass spectra from 250 GeV to 6 TeV is presented. The data were recorded during Run 2 of the LHC by the ATLAS experiment using proton-proton ($pp$) collisions with a center-of-mass energy of $\sqrt{s} = 13$ TeV. The integrated luminosity of the data corresponds to 139 fb$^{-1}$. The background models are a functional form fit to the data, and generic signal shapes are used to represent various models with different resonant widths and masses. No significant deviation from the expected background is observed and 95\% confidence level upper lim…
The newest results from the ATLAS Collaboration for the production of a top-quark pair in association with a $Z$ or $W$ boson, and for the production of four top quarks, are summarised in these proceedings. The measurements were performed with 36.1 fb$^{-1}$ of proton-proton collision data from the Large Hadron Collider at a centre-of-mass energy of 13 TeV.
Search for WZ resonances in the fully leptonic channel using pp collisions at sqrt(s) = 8 TeV with the ATLAS detector
本文利用ATLAS实验收集的20.3fb ~（-1）sqrt（s）= 8 TeV pp碰撞数据，研究了lnul ~（1，1 ~'= e，μ）衰变道中共振WZ的产生。从标准模型的预测没有显着的偏差，观察和上限的生产截面的WZ共振从扩展规范模型W'和从一个简化的模型重矢量三重态。在95%的置信水平下，W'的相应观测（预期）质量下限为1.52（1.49）TeV。
A Search for $t\bar{t}$ Resonances in Lepton Plus Jets Events with ATLAS using 14 fb$^{-1}$ of Proton-Proton Collisions at $\sqrt{s}$ = 8 TeV
一些超越标准模型的理论预言新粒子主要衰变为顶-反顶夸克对。在大型强子对撞机（LHC）的ATLAS实验中，利用$\sqrt{s}$ = 8 TeV的14 fb $^{-1}$，对衰变到轻子加喷流末态的顶-反顶夸克共振进行了研究.搜索考虑了两种情况，即所有的终态喷流都是孤立的，以及一些或所有的顶夸克衰变产物合并成一个喷流。在95%的可信度水平的质量排斥限制设置为两个基准模型，一个预测轻子顶色Z'玻色子和其他预测兰德尔Sundrum卡鲁扎克莱因胶子。
A search for ttbar resonances with the ATLAS detector in 2.05 fb^-1 of proton-proton collisions at sqrt(s) = 7 TeV
欧洲核子研究中心大型强子对撞机的ATLAS实验已经在含有至少一个电子或μ子的末态中进行了顶夸克对共振的搜索。该搜索使用的数据样本对应于2.05 fb^-1的积分亮度，这是在2011年以7 TeV的质子-质子质心能量记录的。没有发现共振的证据，并且对窄共振和宽共振的生产横截面乘以分支比到ttbar设定了限制。对于窄Z'玻色子，当质量在m_Z' = 500 GeV到m_Z' = 1300 GeV范围内时，观测到的95%可信度水平极限在9.3 pb到0.95 pb之间。对于疏轻子顶色Z'玻色子（Randall-Sundrum模型中的Kaluza-Klein胶子激发），其相应的排斥质量区为m_Z' < 880 GeV（m_{g_KK} < 1130 GeV）。
This Letter presents a search for new light resonances decaying to pairs of quarks and produced in association with a high-$p_{\textrm{T}}$ photon or jet. The dataset consists of proton-proton collisions with an integrated luminosity of 36.1 fb$^{-1}$ at a centre-of-mass energy of $\sqrt{s}=13$ TeV recorded by the ATLAS detector at the Large Hadron Collider. Resonance candidates are identified as massive large-radius jets with substructure consistent with a particle decaying into a quark pair. The mass spectrum of the candidates is examined for local excesses above background. No evidence of a…
A search is conducted for new resonances decaying into a $WW$ or $WZ$ boson pair, where one $W$ boson decays leptonically and the other $W$ or $Z$ boson decays hadronically. It is based on proton-proton collision data with an integrated luminosity of 36.1 fb$^{-1}$ collected with the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV in 2015 and 2016. The search is sensitive to diboson resonance production via vector-boson fusion as well as quark-antiquark annihilation and gluon-gluon fusion mechanisms. No significant excess of events is observed with…
A search for high-mass resonances decaying into $τ^{+}τ^{-}$ final states using proton-proton collisions at $\sqrt{s}= 8$ TeV produced by the Large Hadron Collider is presented. The data were recorded with the ATLAS detector and correspond to an integrated luminosity of 19.5-20.3 fb$^{-1}$. No statistically significant excess above the Standard Model expectation is observed; 95% credibility upper limits are set on the cross section times branching fraction of $Z^{\prime}$ resonances decaying into $τ^+τ^-$ pairs as a function of the resonance mass. As a result, $Z^{\prime}$ bosons of the Sequen…
An overview of the analyses that led to the observation of the Higgs boson production in association with a top quark pair ($t\bar t H$) with the ATLAS experiment is given. Up to 80 fb$^{-1}$ of proton-proton collision data recorded by the ATLAS experiment at a center-of-mass energy of $\sqrt{s} = 13$ TeV at the Large Hadron Collider (LHC) have been used to achieve this major milestone.
A search for resonances produced in 13 TeV proton-proton collisions and decaying into top-quark pairs is presented. In this study events where the top-quark decay produces a single isolated charged lepton, missing transverse momentum and jet activity compatible with a hadronic top-quark decay recorded with the ATLAS detector at the Large Hadron Collider (LHC) are considered. We investigate the observed invariant mass spectrum in a model-independent approach to seek for any significant deviation from the Standard Model (SM) background expectation. The Matrix Method was used to estimate the QCD …
Many extensions of the Standard Model predict new resonances decaying to a $Z$, $W$, or Higgs boson and a photon. This paper presents a search for such resonances produced in $pp$ collisions at $\sqrt{s} = 13$ $\mathrm{TeV}$ using a dataset with an integrated luminosity of 36.1 fb$^{-1}$ collected by the ATLAS detector at the Large Hadron Collider. The $Z/W/H$ bosons are identified through their decays to hadrons. The data are found to be consistent with the Standard Model expectation in the entire investigated mass range. Upper limits are set on the production cross section times branching fr…
A search for ttbar resonances in lepton+jets events with highly boosted top quarks collected in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
我们对2011年在大型强子对撞机上利用ATLAS实验收集到的2.05 fb^-1的质子-质子碰撞数据（sqrt（s）= 7 TeV）进行了高质量顶夸克对共振产生的研究。这种对轻子+喷流末态的分析是专门为高度提升的顶夸克衰变产生的特定拓扑而设计的。观察到的ttbar不变质谱被发现是兼容的标准模型的预测和95%的可信度水平的上限上的ttbar生产率，通过新的大量的国家。在窄的1 TeV共振的产生截面乘以分支分数上设定0.7pb的上限。质量小于1.5 TeV的卡鲁扎-克莱因胶子被排除在外。
An overview of the searches for heavy resonances that decay to leptons or quarks is presented. The results are based on the data collected by the ATLAS and CMS experiments in proton-proton collisions at $\sqrt{s} = 13~\textrm{TeV}$, and include for the first time the entire LHC Run 2 data set.
A search for neutral heavy resonances is performed in the $WW\to eνμν$ decay channel using $pp$ collision data corresponding to an integrated luminosity of 36.1 fb$^{-1}$, collected at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. No evidence of such heavy resonances is found. In the search for production via the quark--antiquark annihilation or gluon--gluon fusion process, upper limits on $σ_X \times B(X \to WW)$ as a function of the resonance mass are obtained in the mass range between 200 GeV and up to 5 TeV for various benchmark models: a Higgs-like …
A search is performed for localised excesses in dijet mass distributions of low-dijet-mass events produced in association with a high transverse energy photon. The search uses up to 79.8 fb$^{-1}$ of LHC proton-proton collisions collected by the ATLAS experiment at a centre-of-mass energy of 13 TeV during 2015-2017. Two variants are presented: one which makes no jet flavour requirements and one which requires both jets to be tagged as $b$-jets. The observed mass distributions are consistent with multi-jet processes in the Standard Model. The data are used to set upper limits on the production …
This article describes a search for high-mass resonances decaying to a pair of photons using a sample of $20.3$ fb$^{-1}$ of $pp$ collisions at $\sqrt{s}=8$ TeV recorded with the ATLAS detector at the Large Hadron Collider. The data are found to be in agreement with the Standard Model prediction, and limits are reported in the framework of the Randall-Sundrum model. This theory leads to the prediction of graviton states, the lightest of which could be observed at the Large Hadron Collider. A lower limit of $2.66$ ($1.41$) TeV at 95% confidence level is set on the mass of the lightest graviton …
A search for a new resonance decaying to a $W$ or $Z$ boson and a Higgs boson in the $\ell \ell/ \ell ν/ νν+ b \bar{b}$ final states is performed using 20.3 fb$^{-1}$ of $pp$ collision data recorded at $\sqrt{s}=$ 8 TeV with the ATLAS detector at the Large Hadron Collider. The search is conducted by examining the $WH/ZH$ invariant mass distribution for a localized excess. No significant deviation from the Standard Model background prediction is observed. The results are interpreted in terms of constraints on the Minimal Walking Technicolor model and on a simplified approach based on a phenomen…
A search is presented for narrow diboson resonances decaying to $WW$ or $WZ$ in the final state where one $W$ boson decays leptonically (to an electron or a muon plus a neutrino) and the other $W/Z$ boson decays hadronically. The analysis is performed using an integrated luminosity of 20.3 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 8 TeV collected by the ATLAS detector at the LHC. No evidence for resonant diboson production is observed, and resonance masses below 700 GeV and 1490 GeV are excluded at 95% confidence level for the spin-2 Randall-Sundrum bulk graviton $G^*$ with coupling constan…
A search for heavy resonances decaying into a pair of $Z$ bosons leading to $\ell^+\ell^-\ell^+\ell^-$ and $\ell^+\ell^-ν\barν$ final states, where $\ell$ stands for either an electron or a muon, is presented. The search uses proton proton collision data at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 36.1 fb$^{-1}$ collected with the ATLAS detector during 2015 and 2016 at the Large Hadron Collider. Different mass ranges for the hypothetical resonances are considered, depending on the final state and model. The different ranges span between 200 GeV and 2000 Ge…
A search for high-mass resonances decaying to $τν$ using proton-proton collisions at $\sqrt{s}$ = 13 TeV produced by the Large Hadron Collider is presented. Only $τ$-lepton decays with hadrons in the final state are considered. The data were recorded with the ATLAS detector and correspond to an integrated luminosity of 36.1 fb$^{-1}$. No statistically significant excess above the Standard Model expectation is observed; model-independent upper limits are set on the visible $τν$ production cross section. Heavy $W^{\prime}$ bosons with masses less than 3.7 TeV in the Sequential Standard Model and…
A search for scalar particles decaying via narrow resonances into two photons in the mass range $65-600$ GeV is performed using 20.3 fb$^{-1}$ of $\sqrt{s}$ = 8 TeV $pp$ collision data collected with the ATLAS detector at the Large Hadron Collider. The recently discovered Higgs boson is treated as a background. No significant evidence for an additional signal is observed. The results are presented as limits at the 95 % confidence level on the production cross-section of a scalar boson times branching ratio into two photons, in a fiducial volume where the reconstruction efficiency is approximat…
This Letter presents a search for new resonances with mass larger than 250 GeV, decaying to a $Z$ boson and a photon. The dataset consists of an integrated luminosity of 3.2 fb$^{-1}$ of $pp$ collisions collected at $\sqrt{s} = 13$ TeV with the ATLAS detector at the Large Hadron Collider. The $Z$ bosons are identified through their decays either to charged, light, lepton pairs ($e^+e^-$, $μ^+μ^-$) or to hadrons. The data are found to be consistent with the expected background in the whole mass range investigated and upper limits are set on the production cross section times decay branching rat…
Search for electroweak-scale dijet resonances using trigger-level analysis with the ATLAS detector in $132$ fb$^{-1}$ of $pp$ collisions at $\sqrt{s} = 13$ TeV
利用ATLAS探测器在13 TeV碰撞数据中，通过触发级分析寻找电弱尺度双喷注共振，并设定了相关模型的上限。
A search for a narrow scalar resonance decaying into an opposite-sign muon pair produced in events with and without $b$-tagged jets is presented in this paper. The search uses 36.1 fb$^{-1}$ of $\sqrt{s}= 13$ TeV proton-proton collision data recorded by the ATLAS experiment at the LHC. No significant excess of events above the expected Standard Model background is observed in the investigated mass range of 0.2 to 1.0 TeV. The observed upper limits at 95$\%$ confidence level on the cross section times branching ratio for $b$-quark associated production and gluon-gluon fusion are between 1.9 and…
Search for tb resonances in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector
这封信提出了一个搜索的tb共振在1.04/fb的大型强子对撞机质子-质子碰撞数据收集的ATLAS探测器在质心能量为7 TeV。事件与轻子，失踪的横向动量，和两个喷流被选中，并重建相应的最终状态的不变质量。该搜索利用与预期的标准模型背景相比的tb不变质量分布的形状。选择具有类似标准模型耦合的右手W '_R模型作为该搜索的基准模型。在数据中没有观察到统计上显著的事件过量，并且对于W '_R质量范围从0.5到2.0 TeV，在95%CL下W'_R共振的横截面乘以分支比的上限在6.1-1.0 pb的范围内。这些极限被转换成允许的右手W '_R质量的下限，在95% CL下给出m_{W'_R} > 1.13 TeV。
Search for a heavy narrow resonance decaying to e mu, e tau, or mu tau with the ATLAS detector in sqrt(s) = 7 TeV pp collisions at the LHC
这封信提出了一个搜索的结果，一个重粒子衰变到一个e μ，e τ，或μ τ的最终状态在pp碰撞在sqrt（s）= 7 TeV。这些数据是2011年在LHC上用ATLAS探测器记录的，对应的积分亮度为4.6/fb。没有观察到明显超过标准模型预期的结果，并且在95%的置信水平上排除了产生违反R宇称的超对称τ中微子的截面乘以分支比。这些结果大大扩展了Tevatron实验的限制。
Search for boosted low-mass resonances decaying into hadrons produced in association with a photon in pp collisions at $\sqrt{s}=$13 TeV with the ATLAS detector
本研究利用ATLAS探测器140 fb⁻¹的13 TeV pp碰撞数据，通过初始态辐射光子触发并搜索与光子反冲的双分支子结构大半径喷注不变质量谱，寻找20-100 GeV低质量强子衰变共振态，结果与标准模型一致并设定Z'耦合上限。
The latest ATLAS results for processes with a top quark pair and an associated vector boson are presented here. The measurement of the production cross sections for these processes is important for the direct determination of the top quark couplings to gauge bosons and for constraints on new physics models, in particular for models which go beyond the Standard Model regarding the mechanism for the mass generation.
A search is presented for new resonances decaying to a $W$ or $Z$ boson and a Higgs boson in the $\ell^+ \ell^- b\bar b$, $\ellνb\bar b$, and $ν\barν b\bar b$ channels in $pp$ collisions at $\sqrt s = 13$ TeV with the ATLAS detector at the Large Hadron Collider using a total integrated luminosity of 3.2 fb$^{-1}$. The search is conducted by looking for a localized excess in the $WH$/$ZH$ invariant or transverse mass distribution. No significant excess is observed, and the results are interpreted in terms of constraints on a simplified model based on a phenomenological Lagrangian of heavy vecto…
This paper reports on a search for heavy resonances decaying into $WW$, $ZZ$ or $WZ$ using proton-proton collision data at a centre-of-mass energy of $\sqrt{s}=13$ TeV. The data, corresponding to an integrated luminosity of 139 $\mathrm{fb^{-1}}$, were recorded with the ATLAS detector from 2015 to 2018 at the Large Hadron Collider. The search is performed for final states in which one $W$ or $Z$ boson decays leptonically, and the other $W$ boson or $Z$ boson decays hadronically. The data are found to be described well by expected backgrounds. Upper bounds on the production cross sections of he…
This letter presents a search for new resonances decaying to final states with a vector boson produced in association with a high transverse momentum photon, $Vγ$, with $V= W(\rightarrow \ell ν)$ or $Z(\rightarrow \ell^{+} \ell^{-})$, where $\ell = e$ or $μ$. The measurements use 20.3 fb$^{-1}$ of proton-proton collision data at a center-of-mass energy of $\sqrt{s}=8$ TeV recorded with the ATLAS detector. No deviations from the Standard Model expectations are found, and production cross section limits are set at 95% confidence level. Masses of the hypothetical $a_{T}$ and $ω_{T}$ states of a b…
Search for high-mass dilepton resonances in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector
大型强子对撞机上的ATLAS探测器被用来寻找衰减到双电子或双μ子终态的高质量共振。结果是从质子-质子（PP）碰撞在质心能量为8 TeV对应的积分亮度为20.3 fb-1的双电子通道和20.5 fb-1的双μ子通道的分析。在95%的置信水平下，排除了与费米子的标准模型Z耦合的窄共振，其中双电子通道中的质量小于2.79 TeV，双μ子通道中的质量小于2.53 TeV，两个通道中的质量小于2.90 TeV。对其他模型的解释也提出了限制，包括基于E6规范群的大统一模型，Z* 玻色子，最小Z'模型，来自Randall-Sundrum模型的自旋-2引力子激发，量子黑洞和具有复合希格斯玻色子玻色子的最小步行技术色模型。
This Letter presents a search for the production of new heavy resonances decaying into a Higgs boson and a photon using proton-proton collision data at $\sqrt{s}=13$ TeV collected by the ATLAS detector at the LHC. The data correspond to an integrated luminosity of 139 fb$^{-1}$. The analysis is performed by reconstructing hadronically decaying Higgs boson $(H\to b\bar{b})$ candidates as single large-radius jets. A novel algorithm using information about the jet constituents in the center-of-mass frame of the jet is implemented to identify the two $b$-quarks in the single jet. No significant ex…
Pursuit of paired dijet resonances in the Run 2 dataset with ATLAS
本研究利用ATLAS探测器Run 2期间的140 fb⁻¹数据，寻找衰变为成对双喷注共振的大质量共振态，未发现超出标准模型的显著事件超出，并对新物理场景的截面设定了上限。
Narrow resonances decaying into $WW$, $WZ$ or $ZZ$ boson pairs are searched for in 36.7 fb $^{-1}$ of proton-proton collision data at a centre-of-mass energy of $\sqrt{s}=13$ TeV recorded with the ATLAS detector at the Large Hadron Collider in 2015 and 2016. The diboson system is reconstructed using pairs of large-radius jets with high transverse momentum and tagged as compatible with the hadronic decay of high-momentum $W$ or $Z$ bosons, using jet mass and substructure properties. The search is sensitive to diboson resonances with masses in the range 1.2-5.0 TeV. No significant excess is obse…
This paper reports searches for heavy resonances decaying into $ZZ$ or $ZW$ using data from proton--proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV. The data, corresponding to an integrated luminosity of 36.1 fb$^{-1}$, were recorded with the ATLAS detector in 2015 and 2016 at the Large Hadron Collider. The searches are performed in final states in which one $Z$ boson decays into either a pair of light charged leptons (electrons and muons) or a pair of neutrinos, and the associated $W$ boson or the other $Z$ boson decays hadronically. No evidence of the production of heavy re…
A search for new resonances decaying into jets containing b-hadrons in $pp$ collisions with the ATLAS detector at the LHC is presented in the dijet mass range from 0.57 TeV to 7 TeV. The dataset corresponds to an integrated luminosity of up to 36.1 fb$^{-1}$ collected in 2015 and 2016 at $\sqrt{s} = 13$ TeV. No evidence of a significant excess of events above the smooth background shape is found. Upper cross-section limits and lower limits on the corresponding signal mass parameters for several types of signal hypotheses are provided at 95% CL. In addition, 95% CL upper limits are set on the c…
A search for Higgs boson decays into a $Z$ boson and a light resonance in two-lepton plus jet events is performed, using a $pp$ collision dataset with an integrated luminosity of 139 fb$^{-1}$ collected at $\sqrt{s}=13$ TeV by the ATLAS experiment at the CERN LHC. The resonance considered is a light boson with a mass below 4 GeV from a possible extended scalar sector, or a charmonium state. Multivariate discriminants are used for the event selection and for evaluating the mass of the light resonance. No excess of events above the expected background is found. Observed (expected) 95$\% $ confid…
A search for massive coloured resonances which are pair-produced and decay into two jets is presented. The analysis uses 36.7 fb$^{-1}$ of $\sqrt{s}=$ 13 TeV pp collision data recorded by the ATLAS experiment at the LHC in 2015 and 2016. No significant deviation from the background prediction is observed. Results are interpreted in a SUSY simplified model where the lightest supersymmetric particle is the top squark, $\tilde{t}$, which decays promptly into two quarks through $R$-parity-violating couplings. Top squarks with masses in the range 100 GeV < $m_{\tilde{t}}$ < 410 GeV are excluded at …
Narrow resonances decaying into $WW$, $WZ$ or $ZZ$ boson pairs are searched for in 139 fb$^{-1}$ of proton-proton collision data at a centre-of-mass energy of $\sqrt{s}=13$ TeV recorded with the ATLAS detector at the Large Hadron Collider from 2015 to 2018. The diboson system is reconstructed using pairs of high transverse momentum, large-radius jets. These jets are built from a combination of calorimeter- and tracker-inputs compatible with the hadronic decay of a boosted $W$ or $Z$ boson, using jet mass and substructure properties. The search is performed for diboson resonances with masses gr…
A search for heavy resonances decaying into a pair of $Z$ bosons leading to $\ell^+\ell^-\ell'^+\ell'^-$ and $\ell^+\ell^-ν\barν$ final states, where $\ell$ stands for either an electron or a muon, is presented. The search uses proton-proton collision data at a centre-of-mass energy of 13 TeV collected from 2015 to 2018 that corresponds to the full integrated luminosity of 139 fb$^{-1}$ recorded by the ATLAS detector during Run 2 of the Large Hadron Collider. Different mass ranges spanning 200 GeV to 2000 GeV for the hypothetical resonances are considered, depending on the final state and mode…
Search for heavy resonances, and resonant diboson production with the ATLAS detector
重共振衰变成一对基本粒子，如$jj$、$\ell^+\ell^-$、$γγ$和$\ellν$，是寻找标准模型（SM）之外现象的最常见特征之一。电弱玻色子对的产生，如$WW$或$ZZ$，随后分别衰变为$\ellν\ell'ν'$和$\ell\ell jj$，是对SM自发破缺规范对称性的有力检验，也可以用来寻找SM之外的现象。有一个广泛的理论模型预测这些类型的共振签名。本说明涵盖了2011年和2012年在ATLAS内分别针对LHC 7和8 TeV质心能量进行的这些新现象的几次搜索。没有观察到与SM的显著偏差，因此，对几个新的物理模型的特征参数设置了限制。这些基准模型包括新的重$Z'/W'$规范玻色子，SM弱规范玻色子的手征激发，$Z^*/W^*$ Randal-Sundrum和ADD引力子，夸克的复合模型，例如具有子结构尺度$Λ$的$q^*$，量子黑洞，$γ/Z$的TeV $^{-1}$ Kaluza-Klein激发等。
Search for resonances decaying into top-quark pairs using fully hadronic decays in pp collisions with ATLAS at sqrt(s) = 7 TeV
本文描述了在7 TeV质子-质子碰撞中产生的共振和衰变成顶夸克对的研究。在这封信中，我们考虑了大型强子对撞机ATLAS探测器记录的顶夸克衰变产生两个具有大横向动量的大质量喷流的事件。两种依赖于喷注子结构的技术被用来从轻夸克和胶子产生的喷注中分离顶夸克喷注。此外，每个大质量喷流都需要有相关的底夸克衰变的证据。这些数据与标准模型是一致的，并且可以对Z'玻色子和Kaluza-Klein胶子共振的产生截面乘以分支分数进行限制。在95%的可信度水平上，这些极限不包括质量为0.70-1.00 TeV的Z'玻色子以及质量为1.28-1.32 TeV的Z'玻色子和质量为0.70-1.62 TeV的卡鲁扎-克莱因胶子。
Search for high-mass resonances decaying to dilepton final states in pp collisions at a center-of-mass energy of 7 TeV with the ATLAS detector
大型强子对撞机上的ATLAS探测器用于寻找衰变为电子-正电子对或μ子-反μ子对的高质量共振。该搜索对重中性Z'规范玻色子、Randall-Sundrum引力子、Z* 玻色子、techni-meson、Kaluza-Klein Z/gamma玻色子和Torsion模型预测的玻色子很敏感。结果的基础上提出的PP碰撞在一个质心的能量为7 TeV对应的积分亮度为4.9/FB的双电子通道和5.0/FB的双μ子通道的分析。对于质量低于2.22 TeV的Z'玻色子，在95%的置信水平下排除了具有标准模型样耦合的Z'玻色子。一个耦合k/Mbar = 0.1的Randall-Sundrum引力子被排除在95%的置信水平下，质量低于2.16 TeV。对其他模型的限制也被提出，包括Technicolor和Minimal Z'模型。
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