Liza Mijovic
As the Higgs boson turns 10 this Summer, and the Large Hadron Collider experiments eagerly await the next round of data-taking, the ATLAS collaboration has recently reached important new insights into the Higgs mechanism. This report is a snapshot of Higgs highlights for the MoriondQCD conference, obtained with 139 ifb of Run2 proton-proton collision data taken at centre-of-mass energy of 13 TeV.
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The combined measurement of the mass, couplings and spin-CP properties of the recently discovered Higgs boson obtained with the ATLAS detector using up to $25$ fb$^{-1}$ of $7$ TeV and $8$ TeV $pp$ collision data is reviewed.
An overview of recent results in Higgs boson physics obtained with the ATLAS and CMS experiments at the Large Hadron Collider located at CERN, Geneva, is presented. The focus is on measurements of the properties of the recently discovered Higgs boson with a mass of about 125 GeV. A brief selection of results in searches for Higgs bosons beyond the Standard Model is given, and prospects of future Higgs boson measurements and searches at the LHC are discussed.
The present status of ATLAS searches for Higgs bosons in extensions of the Standard Model (SM) is presented. This includes searches for the Higgs bosons of the Two-Higgs-Doublet Model (2HDM), the Minimal Supersymmetric Model (MSSM), the Next-to-Minimal Supersymmetric Model (NMSSM) and models with an invisibly decaying Higgs boson. A review of the phenomenology of the Higgs sectors of these models is given together with the search strategy and the resulting experimental constraints.
The search for evidence of beyond Standard Model Higgs bosons is an integral part of the Higgs boson studies at the LHC. This article reviews recent beyond Standard Model Higgs boson searches using Run I LHC proton-proton collision data recorded by the ATLAS detector. In particular, searches for Higgs boson cascades, double Higgs boson production, scalar particles decaying to $γγ$ pairs, flavor changing neutral currents involving Higgs bosons, and Higgs bosons decaying to invisible particles are discussed. No significant deviations from the background expectations are found and corresponding c…
Searching for additional Higgs bosons at ATLAS
针对标准模型的遗留问题，研究依托ATLAS实验采集的LHC Run 2阶段13 TeV质子-质子对撞数据，开展额外希格斯玻色子的直接搜寻，为扩展希格斯机制的相关理论提供实验验证方向。
A concise review of precision measurements in the Higgs sector of the Standard Model (SM) of particle physics is given using ATLAS and CMS data. The results are based on LHC Run-2 data, taken between 2015 and 2018. Impressive progress has been made since the discovery of the Higgs boson in 2012 for measuring all major production and decay modes. Good agreement with the SM predictions was observed in all measurements.
Recently, we proposed to picture the Higgs condensate of the Standard Model as a quantum liquid analogous to the superfluid Helium II. In this scenario the Higgs condensate excitations resemble closely two Standard Model Higgs bosons. The lightest Higgs boson was already identified with the LHC narrow resonance at 125 GeV. Concerning the heavy Higgs boson, we found preliminary evidence in our previous phenomenological analysis in the so-called golden channel. In the present note we compared our proposal to the full Run 2 data set released recently by the ATLAS Collaboration. Even though we do …
Searches for Higgs bosons in different extensions of the Standard Model (SM) are presented. These include the Minimal Supersymmetric extension of the SM (MSSM), the next-to-MSSM (NMSSM), models with additional scalar singlets, doublets, or triplets, and generic searches for models with couplings modified with respect to the SM or for non-SM Higgs boson decay channels. Results are based on data collected by the ATLAS and CMS experiments in 2011 and 2012 at the LHC. No excess is found in any of the searches and thus the resulting exclusion limits are given.
Since the discovery of the Higgs boson in summer 2012, the understanding of its properties has been a high priority of the ATLAS physics program. Measurements of Higgs boson properties sensitive to its production processes, decay modes, kinematics, mass, and spin/CP properties based on $pp$ collision data recorded at 13 TeV are presented. The analyses of several production processes and decay channels will be described, including recent highlights as the direct observation of the couplings to top and beauty quarks, and an updated combination of all measurements.
We present two modules as part of the Czech Particle Physics Project (CPPP). These modules are intended as learning tools in masterclasses aimed at high-school students (aged 15 to 18). The first module is dedicated to the detection of an Axion-Like-Particle (ALP) using the ATLAS Forward Proton (AFP) detector. The second module focuses on the reconstruction of the Higgs boson mass using the Higgs boson golden channel with four leptons in the final state. The modules are accessible at http://cern.ch/cppp.
Higgs cross-section ( including di-Higgs ) with CMS and ATLAS
本文综述了CMS与ATLAS通过总截面、STXS微分截面及双希格斯产生搜索三类分析检验希格斯玻色子性质，并探索超出标准模型物理及希格斯自耦合的研究进展。
Higgs boson production and decay at the LHC is described, together with related ATLAS search channels, in order to provide an overview of the ATLAS Higgs discovery potential.
ATLAS exclusion and discovery potentials of Standard Model Higgs boson searches at the LHC at 14 TeV, 10 TeV and 7 TeV center-of-mass energy are reviewed. For a LHC center-of-mass energy of 7 TeV and integrated luminosity of 1 fb$^{-1}$, contributions from the important decay channels $\Hboson \rightarrow \Wboson\Wboson^{(*)} \rightarrow \ellν\ellν$, $\Hboson \rightarrow \Zboson\Zboson^{(*)} \rightarrow \ell\ell\ell\ell$ and $\Hboson \rightarrow γγ$ are considered, based on recent full Monte Carlo simulations at 14 and 10 TeV and the cross-section rescaling for the 7 TeV center-of-mass energy.…
We discuss the implications of the recent constraints on the Higgs sector of the Minimal Supersymmetric extension of the Standard Model obtained by the ATLAS and CMS collaborations at the lHC with $\sqrt s=7$ TeV and 36 pb$^{-1}$ of data. The main production and detection channel that is relevant in these analyses is the gluon--gluon and bottom quark fusion mechanisms leading to neutral Higgs bosons which subsequently decay into tau lepton pairs, $gg, b\bar b \to Higgs \to τ^+τ^-$. In this note, we show that: i) the exclusion limits are in fact more general than indicated by the ATLAS and CMS …
This report summarizes latest ATLAS and CMS results on Higgs boson couplings to fermions.~Presented topics include decays into final states of pairs of tau leptons and pairs of bottom quarks as well as results on the ttH production mode.~Results are complemented by tests of the CP invariance and searches for lepton flavor violating decays.~Finally, prospects of future Higgs boson analyses within the scope of the High Luminosity LHC program are discussed.~The presented results mostly use LHC 2016 data collected at a center-of-mass energy of $\sqrt{\mathrm{s}}=13~$TeV corresponding to an integra…
Measurement of the differential Higgs boson production cross sections in ATLAS and CMS experiments
本文基于ATLAS和CMS在13 TeV、最高140 fb$^{-1}$的质子-质子对撞数据，测量希格斯玻色子产生的基准微分截面，结果与标准模型一致，并用于约束希格斯玻色子与其他标准模型粒子间的反常相互作用。
The status of the ATLAS Higgs boson search using about 5 fb^-1 of data recorded in 2011 is summarized. Proceedings from Physics at the LHC 2012 (Vancouver).
Limits on an Exotic Higgs Decay From a Recast ATLAS Four-Lepton Analysis
本研究复现了 ATLAS 对 $Z$ 玻色子衰变为暗光子的分析限制，并将其重铸为对 Higgs 玻色子经由中间（赝）标量衰变为四个暗光子的奇异衰变模式的分支比限制。
Rare and Exotic Higgs decays at ATLAS and CMS
本文介绍ATLAS和CMS实验利用Run 2全部数据，通过先进在线选择和分析技术搜寻希格斯玻色子稀有及奇异衰变模式的新结果，以探索超越标准模型的新物理。
A summary of the sensitivity of the ATLAS and CMS experiments at the LHC to discover a Standard Model Higgs boson is presented. Some prospects for Minimal Supersymmetric Standard Model Higgs searches at LHC are also included.
Lessons from ATLAS and CMS measurements of Higgs boson decays to second generation fermions
本文基于 ATLAS 和 CMS 对希格斯玻色子衰变至第二代费米子的测量数据，分析了这些结果对 SMEFT、2HDM 等多种 Standard Model 扩展模型的物理含义。
The most recent results for searches for the Standard Model Higgs boson at a center-of-mass energy of sqrt(s) = 7 TeV using 4.9/fb of data collected with the ATLAS detector at CERNs Large Hadron Collider are presented.
The latest search for the Standard Model (SM) Higgs boson based on 4.7-4.9 fb-1 of pp collision data at sqrt(s)=7 TeV recorded with the ATLAS detector is presented here.
Effective field theory interpretation of ATLAS measurements involving the Higgs boson, electroweak bosons and the top quark
通过联合拟合ATLAS多项测量数据，约束维度-6有效场论中的Wilson系数，未发现与标准模型的显著偏差。
We report results of a study of the Standard Model Higgs boson discovery potential through the W-pair leptonic decay modes with the ATLAS detector at LHC at 14 TeV center-of-mass energy. We used MC samples with full detector simulation and reconstruction of the ATLAS experiment to estimate the ATLAS detection sensitivity for the reaction of pp -> H -> WW -> eνμνwith no hard jet or two hard jets in the final states. The prospects for the Higgs boson searches at ATLAS are presented, including trigger efficiencies and data-driven methods to estimate the backgrounds using control samples in data. …
The ATLAS Higgs results are reviewed using Run-2 data taken at a center-of-mass energy of 13 TeV with up to an integrated luminosity of 80 fb$^{-1}$. So far, the data are consistent with the standard model expectations. ATLAS now has observed the Higgs Yukawa coupling to the third generation fermions with $H\rightarrow ττ$, ttH, and $H\rightarrow b b$ in the VH process. The Higgs boson will continue to provide an important probe for new physics and beyond.
Searches for rare and exotic Higgs decays using proton-proton collision data with the center-of-mass energy of 8 TeV and 13 TeV collected with the ATLAS detector are presented. Various final states are considered. No significant deviations from the Standard Model expectations are found. The results are interpreted in different Beyond Standard Model theories.
The search for Higgs boson pair ($HH$) production is at the core of the ATLAS experimental program, as it probes the Brout-Englert-Higgs mechanism, as well as new physics beyond the Standard Model. Based on the proton-proton collision data recorded by the ATLAS experiment at CERN's Large Hadron Collider in 2015 and 2016, three public results on the search for $HH \to bbbb$, $HH \to bbγγ$ and $HH \to WWγγ$ were recently released and are summarised in these proceedings.
The ATLAS collaboration has reported excesses in diboson invariant mass searches of new resonances around 2 TeV, which might be a prediction of new physics around that mass range. We interpret these results in the context of a modified stealth doublet model where the extra Higgs doublet has a Yukawa interaction with the first generation quarks, and show that the heavy CP-even Higgs boson can naturally explain the excesses in the WW and ZZ channels with a small Yukawa coupling, ξ\sim 0.15, and a tiny mixing angle with the SM Higgs boson, α\sim 0.06. Furthermore, the model satisfy constraints fr…
As soon as a significant signal in one of the Higgs boson discovery channels is observed, it will be important to establish its nature. To do this, a precise measurements of its properties is important. In this article the prospects to measure the Higgs boson mass, width, spin and CP-quantum numbers, couplings to the known Standard Model particles and self-couplings by the ATLAS experiment are summarized.
Higgs cross-section (including di-Higgs) with ATLAS and CMS
该研究展示ATLAS和CMS实验的希格斯截面最新测量结果，涵盖简化模板截面框架下多衰变模式测量、微分截面及双希格斯截面与自耦合诠释，基于LHC Run 2全数据实现最高灵敏度，推动希格斯物理进入精确时代。
Summary of first ATLAS results is given for the Standard Model Higgs boson in the mass range 110 < mH < 130 GeV, when produced in association with a W/Z boson and decaying to a pair of b-quarks. No evidence for the Higgs boson production is observed in a dataset of proton-proton collisions at a center of mass energy of 7 TeV and corresponding to 1.04 fb-1 of integrated luminosity, recorded by the ATLAS experiment at the LHC in 2011. Upper limits on Higgs boson production cross sections for the channels considered are presented.
The ATLAS Collaboration at the LHC continues investigating the possibility to detect particles predicted by Little Higgs models. In this talk, the latest results on the Z/W h decays and on the hadronic decays of the new gauge bosons Z_H/W_H are reviewed.
Charged Higgs bosons are predicted in several extensions of the Standard Model, where the Higgs sector contains more than one doublet of complex scalars, for instance in the Minimal Supersymmetric Standard Model (MSSM). For $m_{H^+} < m_{\mathrm{top}}$, the dominant production mode for charged Higgs bosons at the LHC is via the decay $t\rightarrow bH^+$ of one of the top quarks in $t\bar{t}$ events. We present results on the search for such light charged Higgs bosons in the ATLAS experiment, with emphasis on the decay $H^+ \rightarrow τν$.
Within the framework of Standard Model, the production mode of Higgs boson through the fusion of the vector bosons $W$ or $Z$ (Vector Boson Fusion) is one of the most important production mechanisms, providing a specific detection signature. A detailed study regarding this issue is being undergone for ATLAS detector in LHC and some general features of this analysis are being presented in this note emphasizing in the study of Central Jet Veto.
Higgs CP studies and other Higgs properties at ATLAS and CMS
利用LHC的ATLAS和CMS探测器在13 TeV和13.6 TeV质子-质子对撞数据，测量了希格斯玻色子的质量、宽度以及CP性质，包括H→γγ和H→WW*通道的宽度测量，以及希格斯-矢量玻色子耦合和希格斯-τ轻子汤川耦合的CP结构分析。
The results of Higgs boson searches in the context of the Minimal Supersymmetric extension of the Standard Model (MSSM) in proton-proton collisions with the ATLAS detector based on collected data corresponding to up to 36 pb-1 are presented. Searches in the channels H+->cs, H+->taunu, and H->tautau are discussed. All observations agree with the expectation of the Standard Model (SM)-only hypothesis and thus exclusion limits are derived.
Probing the nature of electroweak symmetry breaking with Higgs boson pairs in ATLAS
结合ATLAS双希格斯玻色子衰变通道分析，限制了希格斯自耦合与非标准HHVV耦合修正因子，并评估了高亮度LHC前景。
The searches for supersymmetric and beyond Standard Model Higgs boson with the ATLAS detector are presented. The results are based on integrated luminosity of 35 pb$^{-1}$ to 1.6 fb$^{-1}$ of proton-proton collision data recorded at a centre-of-mass energy of 7 TeV at LHC. No signal is observed in any of the investigated channel and exclusion limits on production cross-sections are given as function of Higgs boson mass and of minimal supersymmetric model parameters.
Recent searches for Higgs bosons in the context of extensions to the Standard Model of Particle Physics with the ATLAS detector at the Large Hadron Collider are discussed. All presented analyses use data recorded at a pp center-of-mass energy of 7 TeV in 2011 with integrated luminosities between 1 and 5/fb. No significant deviations from the background expectations are found and corresponding constraints on physics beyond the Standard Model are obtained.
Results for the Standard Model Higgs boson search by the ATLAS experiment in the WH -> lnubb and H -> WW(*) -> lnulnu channels are presented. The results are based on 1.04 fb^-1 of data from pp collisions at sqrt(s) = 7 TeV produced by the LHC in 2011. No evidence is found for the Standard Model Higgs boson in either decay mode. The WH -> lnubb channel is not yet sensitive to the Standard Model Higgs, while the H -> WW(*) -> lnulnu channel excludes the Standard Model Higgs in the range of 158 < m_H < 186 GeV at the 95% confidence level.
Due to the high energy and luminosity of the LHC, the ATLAS experiment has a huge discovery potential for new physics. A Standard Model Higgs boson can be discovered over the full range of allowed masses, and its mass should be measured with a precision of about 0.1%. The Higgs sector of the MSSM should be fully explored by searches for supersymmetric Higgs bosons. Squarks and gluinos can be discovered up to masses of 2.5 TeV and several precision measurements can be performed in the SUSY sector. The existence of particles predicted by other theories beyond the Standard Model has been also inv…
The investigation of the electroweak symmetry breaking is one of the primary tasks of the experiments at the CERN Large Hadron Collider (LHC). The potential of the ATLAS experiment for the discovery of the Higgs boson(s) in Standard Model and Minimal Supersymmetric Standard Model is presented, with emphasis on studies which have been completed recently.
The properties of the Higgs boson measured in bosonic decay channels ($H \rightarrow γγ$, $H \rightarrow ZZ^* \rightarrow 4\ell$, $H \rightarrow WW^{*} \rightarrow \ellν\ellν$, $H \rightarrow Zγ$) with 25 fb$^{-1}$ of pp collision data from the Large Hadron Collider run-1 collected by the ATLAS experiment are presented. The results include an improved measurement of the mass of the Higgs boson from a combined fit to the invariant mass spectra of the decay channels $H \rightarrow γγ$ and $H \rightarrow ZZ^* \rightarrow 4\ell$, which yields $m_H = 125.36 \pm 0.37$ (stat) $\pm 0.18$ (syst) GeV = …
In this paper the results of Higgs searches at the ATLAS experiment, operating at the LHC, are summarised. The results are based on data samples corresponding to an integrated luminosity of up to 20.7 fb-1 at a centre-of-mass energy of 8 TeV and 4.6 fb-1 at 7 TeV. The observation of a Higgs boson is established. The mass of the new boson is measured to be 125.5 +/- 0.2 (stat) +0.5-0.6 (syst) GeV, and the ratio of the observed number of events and expected from a Standard Model Higgs Boson is compatible with unity, mu = 1.30 +/- 0.13 (stat) +/- 0.14 (sys). The spin and parity properties as well…
The search for the Standard Model Higgs boson in the four lepton (electron and muon) final state with the ATLAS detector at the LHC is presented. The analysis strategy and the efficiency for selecting the signal and rejecting the background are discussed, focusing on the performance of the lepton identification that can be achieved with the first data of LHC expected in 2008.
Combined Higgs boson measurements and their interpretations with the ATLAS experiment
本文综述ATLAS合作组对希格斯玻色子多产生与衰变通道的联合测量，并利用BSM情景和标准模型有效场论解释其性质与相互作用的最新结果。
Searches for resonant and nonresonant multi-Higgs production in ATLAS and CMS
本文综述了ATLAS和CMS实验对希格斯玻色子自耦合的测量，通过双希格斯和三希格斯产生研究三线性与四次自耦合，并搜索重标量共振衰变到希格斯对或希格斯加新标量，涵盖多种末态。
A search for the Higgs boson has been performed in the H->WW->lvlv channel (l=e/mu) with an integrated luminosity of 2.05/fb of pp collisions at sqrt(s) = 7 TeV collected with the ATLAS detector at the Large Hadron Collider. No significant excess of events over the expected background is observed and limits on the Higgs boson production cross section are derived for a Higgs boson mass in the range 110<mH<300 GeV. The observations exclude the presence of a Standard Model Higgs boson with a mass 145<mH<206 GeV at 95% confidence level.
The search for the production of the Higgs boson associated with a pair of top quarks in the ATLAS experiment is presented. It focuses on Higgs bosons decaying to $b\bar{b}$ and events containing two leptons (electrons and/or muons). It uses 20.3 fb$^{-1}$ of $pp$ collision data at $\sqrt{s}$ = 8 TeV collected with the ATLAS detector at the LHC in 2012. No significant excess of events is found and the 95% CL observed (expected) limit is 7.0xSM (4.3xSM). After combining with the single lepton final state an observed (expected) limit of 4.1xSM (2.6xSM) with a best fit of $μ=1.7\pm1.4$ is obtaine…
After many years of searches, the Higgs boson was observed by the ATLAS and CMS collaborations in July 2012. Since then, its properties have been measured using primarily the bosonic decay channels: $H \to γγ$, $H \to Z Z$, $H \to W^+ W^-$. In order to probe the predictions of the Standard Model and the nature of the Higgs boson, it is also fundamental to measure its couplings to fermions and, in particular, to quarks. In this paper we present the ATLAS results in the search for the Higgs boson decaying to b-quark pairs using two different production channels: associated production with a vect…
In this article the potential of the ATLAS experiment to discover MSSM Higgs bosons is discussed. Various Monte-Carlo studies for SM Higgs boson production and dedicated MSSM Higgs boson analyses are taken into account to investigate the discovery potential in four different CP-conserving MSSM benchmark scenarios, the Mh-max scenario, the no mixing scenario, the gluophobic scenario and the small alpha scenario. The most recent theoretical calculations are used for the prediction of Higgs masses and couplings. The results are shown for integrated luminosities of 30 and 300 inverse fb. With 300 …
Recent measurements of Higgs boson cross-section and properties are presented using up to $139~\text{fb}^{-1}$ of proton-proton collision data delivered by the Large Hadron Collider at $\sqrt{s}~=~13~\text{TeV}$ and recorded by the ATLAS and CMS detectors. Three measurements are discussed. The first is the measurement of Higgs boson production with sizeable transverse momentum decaying to a $b\bar{b}$ pair. The remaining two measurements exploit the $H \rightarrow WW^*$ decay channel in various production modes: gluon fusion, vector boson fusion, and production in association with a $W$ or $Z$…
ATLAS has developed a new approach for vertex selection in VBF invisible events at HL-LHC conditions, exploiting its new forward tracking capabilities, integrating calorimeter and tracking information to mitigate the impact of pileup vertex merging, and introducing a new way to apply pile-up jet suppression methods for the selection of VBF jets. The new algorithm is insensitive to pileup density and improves the average vertex selection efficiency from 86% to 95% under tight VBF event selection cuts.
The Minimal Supersymmetric extension of the Standard Model (MSSM) predicts the existence of three neutral and two charged Higgs bosons. Searches for these MSSM Higgs bosons are presented, based on proton-proton collisions recorded in 2011 and 2012 by the ATLAS and CMS experiments at the LHC. The neutral Higgs bosons are searched through their decays into pairs of oppositely charged tau leptons. The exclusion limits at 95% confidence level are shown as a function of the $m_A$ and $\tanβ$ parameters. The search for the charged Higgs bosons is based on their production through the decays of top q…
Characterising the Higgs boson with ATLAS data from Run 2 of the LHC
本文综述了ATLAS合作组利用LHC Run 2约140 fb^-1的13 TeV质子-质子对撞数据研究希格斯玻色子性质及其相互作用的主要成果，旨在深化对其理解并寻找超出标准模型的新物理迹象。
A search for the Standard Model Higgs boson has been performed in the H \rightarrow WW \rightarrow lνjj channel in 1.04 fb-1 of pp collisions at \surds = 7 TeV collected with the ATLAS detector at the Large Hadron Collider. No significant excess of events is observed over the expected background and limits on the Higgs boson production cross section are derived for a Higgs boson mass in the range 240 GeV < mH < 600 GeV. The best sensitivity is reached for mH = 400 GeV, where the 95% confidence level upper bound on the cross-section for Higgs boson production times the branching ratio for H \ri…
A review of the searches for the SM Higgs boson produced in association with a pair of top quarks, ${t\bar{t}H}$, using up to 13.3 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 13 TeV collected with the ATLAS detector at the LHC is presented. Searches in the diphoton, multilepton and $b\bar{b}$ decay channels are summarised. The combination of these searches yields a measured (expected) significance for the observation of the ${t\bar{t}H}$ production process of $2.8 σ$ ($1.8 σ$).
The status of Higgs boson measurements in the $WW^{\ast}$, $ττ$, and $μμ$ decay modes with the ATLAS experiment is presented. These measurements are done using $pp$ collision data from the Large Hadron Collider with either the full Run 1 dataset at $\sqrt{s}= 7\,\mathrm{TeV}$ and $\sqrt{s}= 8\,\mathrm{TeV}$ or with a partial Run 2 dataset at $\sqrt{s}= 13\,\mathrm{TeV}$ of either $5.81\,\mathrm{fb}^{-1}$ or $36.1\,\mathrm{fb}^{-1}$. The different couplings to the Higgs boson are probed by measuring the production cross sections and extracting the signal strengths. Depending on the analysis, th…
This proceeding presents the latest studies on the Yukawa couplings of the Standard Model Higgs boson with 139 fb$^{-1}$ data collected using the ATLAS detector at a center-of-mass energy of 13 TeV. A first direct probe of $CP$ violation in the top-quark Yukawa coupling using events where the Higgs boson is produced in association with top quarks ($t\bar{t}H$ and $tH$), and decays into two photons ($H \rightarrow γγ$ ) is discussed. The latest results on the Higgs boson production in association with a $W$ or $Z$ boson ($VH$) in the $H \rightarrow b \bar{b}$ channel are depicted as well. Final…
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