Naimy Farias Castro

• Universidade do Estado do Amazonas

A bstract A measurement of the ratio of the branching fractions, R τ/e = B ( W → τν ) /B ( W → eν ), is performed using a sample of W bosons originating from top-quark decays to final states containing τ -leptons or electrons. This measurement uses pp collisions at $$ \sqrt{s} $$ s = 13 TeV, collected by the ATLAS experiment at the Large Hadron Col...

This paper presents a measurement of jet-track correlations in photon-jet events, using 1.72 nb − 1 of Pb + Pb data at s N N = 5.02 TeV recorded with the ATLAS detector at the LHC. Events with energetic photon-jet pairs are selected, where the photon and jet are approximately back-to-back in azimuth. The angular correlation between jets and charged...

The Lund jet plane (LJP) is measured for the first time in $$t\bar{t}$$ t t ¯ events, using 140 $$\textrm{fb}^{-1}$$ fb - 1 of $$\sqrt{s} = 13$$ s = 13 TeV pp collision data collected with the ATLAS detector at the LHC. The LJP is a two-dimensional observable of the sub-structure of hadronic jets that acts as a proxy for the kinematics of parton sh...

A bstract A study of the Higgs boson decaying into bottom quarks ( H → $$ b\overline{b} $$ b b ¯ ) and charm quarks ( H → $$ c\overline{c} $$ c c ¯ ) is performed, in the associated production channel of the Higgs boson with a W or Z boson, using 140 fb − 1 of proton-proton collision data at $$ \sqrt{s} $$ s = 13 TeV collected by the ATLAS detector...

Top-quark pair production is observed in lead–lead ( Pb + Pb ) collisions at s NN = 5.02 TeV at the Large Hadron Collider with the ATLAS detector. The data sample was recorded in 2015 and 2018, amounting to an integrated luminosity of 1.9 nb − 1 . Events with exactly one electron and one muon and at least two jets are selected. Top-quark pair produ...

A search is performed for dark matter particles produced in association with a resonantly produced pair of b -quarks with 30 < m b b < 150 GeV using 140 fb − 1 of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector at the LHC. This signature is expected in extensions of the standard model predicting the prod...

A search for a dark photon, a new light neutral particle, which decays promptly into collimated pairs of electrons or muons is presented. The search targets dark photons resulting from the exotic decay of the Standard Model Higgs boson, assuming its production via the dominant gluon-gluon fusion mode. The analysis is based on $$140~\hbox {fb}^{-1}$...

In ultrarelativistic heavy ion collisions at the LHC, each nucleus acts a sources of high-energy real photons that can scatter off the opposing nucleus in ultraperipheral photonuclear ( γ + A ) collisions. Hard scattering processes initiated by the photons in such collisions provide a novel method for probing nuclear parton distributions in a kinem...

The ATLAS experiment has developed extensive software and distributed computing systems for Run 3 of the LHC. These systems are described in detail, including software infrastructure and workflows, distributed data and workload management, database infrastructure, and validation. The use of these systems to prepare the data for physics analysis and...

In 2022 and 2023, the Large Hadron Collider produced approximately two billion hadronic interactions each second from bunches of protons that collide at a rate of 40 MHz. The ATLAS trigger system is used to reduce this rate to a few kHz for recording. Selections based on hadronic jets, their energy, and event topology reduce the rate to 𝒪 (10) kHz...

A bstract Differential measurements of Higgs boson production in the τ -lepton-pair decay channel are presented in the gluon fusion, vector-boson fusion (VBF), VH and $$ t\overline{t}H $$ t t ¯ H associated production modes, with particular focus on the VBF production mode. The data used to perform the measurements correspond to 140 fb − 1 of proto...

A bstract A search for exotic decays of the 125 GeV Higgs boson into a pair of new spin-0 particles, H → aa , where one decays into a photon pair and the other into a τ -lepton pair, is presented. Hadronic decays of the τ -leptons are considered and reconstructed using a dedicated tagger for collimated τ -lepton pairs. The search uses 140 fb − 1 of...

A bstract The paper presents a search for supersymmetric particles produced in proton-proton collisions at $$ \sqrt{s} $$ s = 13 TeV and decaying into final states with missing transverse momentum and jets originating from charm quarks. The data were taken with the ATLAS detector at the Large Hadron Collider at CERN from 2015 to 2018 and correspond...

This paper reports the measurement of Higgs boson production in association with a $$t\bar{t}$$ t t ¯ pair in the $$H\rightarrow b\bar{b}$$ H → b b ¯ decay channel. The analysis uses 140 fb $$^{-1}$$ - 1 of 13 $$\text {TeV}$$ TeV proton–proton collision data collected with the ATLAS detector at the Large Hadron Collider. The final states with one o...

A bstract This article presents a search for a heavy charged Higgs boson produced in association with a top quark and a bottom quark, and decaying into a W boson and a 125 GeV Higgs boson h . The search is performed in final states with one charged lepton, missing transverse momentum, and jets using proton-proton collision data at $$ \sqrt{s} $$ s...

The high-luminosity phase of LHC operations (HL-LHC), will feature a large increase in simultaneous proton-proton interactions per bunch crossing up to 200, compared with a typical leveling target of 64 in Run 3. Such an increase will create a very challenging environment in which to perform charged particle trajectory reconstruction, a task crucia...

This Letter presents a search for highly ionizing magnetic monopoles in 262 μ b − 1 of ultraperipheral Pb + Pb collision data at s NN = 5.36 TeV collected by the ATLAS detector at the LHC. A new methodology that exploits the properties of clusters of hits reconstructed in the innermost silicon detector layers is introduced to study highly ionizing...

A search for the production of three Higgs bosons ( H H H ) in the b b ¯ b b ¯ b b ¯ final state is presented. The search uses 126 fb − 1 of proton-proton collision data at s = 13 TeV collected with the ATLAS detector at the Large Hadron Collider. The analysis targets both nonresonant and resonant production of H H H . The resonant interpretations...

A bstract A search for the production of top-quark pairs with the same electric charge ( tt or $$ \overline{tt} $$ tt ¯ ) is presented. The analysis uses proton-proton collision data at $$ \sqrt{s} $$ s = 13 TeV, recorded by the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 140 fb − 1 . Events with two sa...

A bstract A search for T and Y vector-like quarks produced in proton-proton collisions at a centre-of-mass energy of 13 TeV and decaying into Wb in the fully hadronic final state is presented. The search uses 139 fb − 1 of data collected by the ATLAS detector at the LHC from 2015 to 2018. The final state is characterised by a hadronically decaying...

A bstract A search for the production of a Higgs boson and one or more charm quarks, in which the Higgs boson decays into a photon pair, is presented. This search uses proton-proton collision data with a centre-of-mass energy of $$ \sqrt{s} $$ s = 13 TeV and an integrated luminosity of 140 fb − 1 recorded by the ATLAS detector at the Large Hadron C...

A search for a light charged Higgs boson produced in decays of the top quark, $$t \rightarrow H^{\pm } b$$ t → H ± b with $$H^{\pm } \rightarrow cs$$ H ± → c s , is presented. This search targets the production of top-quark pairs $$t\bar{t} \rightarrow Wb H^{\pm } b$$ t t ¯ → W b H ± b , with $$W \rightarrow \ell \nu $$ W → ℓ ν ( $$\ell = e, \mu $$...

A combination of searches for the single production of vectorlike top quarks ( T ) is presented. These analyses are based on proton-proton collisions at s = 13 TeV recorded in 2015–2018 with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb − 1 . The T decay modes considered in this combination are...

The ATLAS Google Project was established as part of an ongoing evaluation of the use of commercial clouds by the ATLAS Collaboration, in anticipation of the potential future adoption of such resources by WLCG grid sites to fulfil or complement their computing pledges. Seamless integration of Google cloud resources into the worldwide ATLAS distribut...

A bstract Many extensions of the Standard Model, including those with dark matter particles, propose new mediator particles that decay into hadrons. This paper presents a search for such low mass narrow resonances decaying into hadrons using 140 fb − 1 of proton-proton collision data recorded with the ATLAS detector at a centre-of-mass energy of 13...

A bstract This paper presents measurements of top-antitop quark pair ( $$ t\overline{t} $$ t t ¯ ) production in association with additional b -jets. The analysis utilises 140 fb − 1 of proton–proton collision data collected with the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy of 13 TeV. Fiducial cross-sections are extrac...

A bstract A search is performed for light, spin-0 bosons decaying into two photons in the 66 to 110 GeV mass range, using 140 fb − 1 of proton-proton collisions at $$ \sqrt{s} $$ s = 13 TeV produced by the Large Hadron Collider and collected by the ATLAS detector. Multivariate analysis techniques are used to define event categories that improve the...

Z boson events at the Large Hadron Collider can be selected with high purity and are sensitive to a diverse range of QCD phenomena. As a result, these events are often used to probe the nature of the strong force, improve Monte Carlo event generators, and search for deviations from standard model predictions. All previous measurements of Z boson pr...

Properties of the underlying-event in pp interactions are investigated primarily via the strange hadrons $$K_{S}^{0}$$ K S 0 , $$\Lambda $$ Λ and $$\bar{\Lambda }$$ Λ ¯ , as reconstructed using the ATLAS detector at the LHC in minimum-bias pp collision data at $$\sqrt{s} = 13$$ s = 13 TeV. The hadrons are reconstructed via the identification of the...

The ATLAS tile calorimeter (TileCal) is the hadronic sampling calorimeter covering the central region of the ATLAS detector at the Large Hadron Collider (LHC). This paper gives an overview of the calorimeter’s operation and performance during the years 2015–2018 (Run 2). In this period, ATLAS collected proton–proton collision data at a centre-of-ma...

Proton–proton collision data recorded by the ATLAS detector in 2011, at a centre-of-mass energy of 7 TeV, have been used for an improved determination of the W -boson mass and a first measurement of the W -boson width at the LHC. Recent fits to the proton parton distribution functions are incorporated in the measurement procedure and an improved st...

A bstract This paper reports a search for a light CP-odd scalar resonance with a mass of 20 GeV to 90 GeV in 13 TeV proton-proton collision data with an integrated luminosity of 140 fb − 1 collected with the ATLAS detector at the Large Hadron Collider. The analysis assumes the resonance is produced via gluon-gluon fusion and decays into a τ ⁺ τ − p...

A bstract This paper presents a search for supersymmetric particles in models with highly compressed mass spectra, in events consistent with being produced through vector boson fusion. The search uses 140 fb − 1 of proton-proton collision data at $$ \sqrt{s} $$ s = 13 TeV collected by the ATLAS experiment at the Large Hadron Collider. Events contai...

High-energy nuclear collisions create a quark-gluon plasma, whose initial condition and subsequent expansion vary from event to event, impacting the distribution of the eventwise average transverse momentum [ P ( [ p T ] ) ]. Disentangling the contributions from fluctuations in the nuclear overlap size (geometrical component) and other sources at a...

A bstract During the 2015–2018 data-taking period, the Large Hadron Collider delivered proton-proton bunch crossings at a centre-of-mass energy of 13 TeV to the ATLAS experiment at a rate of roughly 30 MHz, where each bunch crossing contained an average of 34 independent inelastic proton-proton collisions. The ATLAS trigger system selected roughly...

A search for heavy right-handed Majorana neutrinos is performed with the ATLAS detector at the CERN Large Hadron Collider, using the 140 fb − 1 of proton–proton collision data at s = 13 TeV collected during Run 2. This search targets t t ¯ production, in which both top quarks decay into a bottom quark and a W boson, where one of the W bosons decays...

The need for large-scale production of highly accurate simulated event samples for the extensive physics programme of the ATLAS experiment at the Large Hadron Collider motivates the development of new simulation techniques. Building on the recent success of deep learning algorithms, variational autoencoders and generative adversarial networks are i...

This paper describes a measurement of the jet radius dependence of the dijet momentum balance between leading back-to-back jets in 1.72 nb − 1 of Pb + Pb collisions collected in 2018 and 255 pb − 1 of p p collisions collected in 2017 by the ATLAS detector at the LHC. Both datasets were collected at s NN = 5.02 TeV. Jets are reconstructed using the...

A bstract A search is presented for new particles produced in proton-proton collisions at a centre-of-mass energy of 13 TeV that result in final states comprising a massive vector ( W or Z ) boson that decays hadronically and large missing transverse momentum. The data sample was collected with the ATLAS experiment at the Large Hadron Collider from...

A bstract This paper reports the observation of top-quark pair production in proton-lead collisions in the ATLAS experiment at the Large Hadron Collider. The measurement is performed using 165 nb − 1 of p +Pb data collected at $$ \sqrt{s_{\textrm{NN}}} $$ s NN = 8 . 16 TeV in 2016. Events are categorised in two analysis channels, consisting of eith...

A bstract Measurements of the Higgs boson production times decay rates and differential cross-sections have recently been performed by the ATLAS experiment in several decay channels using up to 139 fb − 1 of proton-proton collision data at $$ \sqrt{s} $$ s = 13 TeV recorded at the Large Hadron Collider. This paper presents multiple interpretations...

A search is presented for direct pair production of the stop, the supersymmetric partner of the top quark, in a decay through an R -parity violating coupling to a charged lepton and a b -quark. The dataset corresponds to an integrated luminosity of 140 fb − 1 of proton-proton collisions at a center-of-mass energy of s = 13 TeV collected between 201...

A bstract A search for the resonant production of a heavy scalar X decaying into a Higgs boson and a new lighter scalar S , through the process X → S (→ $$ b\overline{b} $$ b b ¯ ) H (→ γγ ), where the two photons are consistent with the Higgs boson decay, is performed. The search is conducted using an integrated luminosity of 140 fb − 1 of proton-...

A bstract A search for neutral long-lived particles (LLPs) decaying in the ATLAS hadronic calorimeter using 140 fb − 1 of proton-proton collisions at $$ \sqrt{s} $$ s = 13 TeV delivered by the LHC is presented. The analysis is composed of three channels. The first targets pair-produced LLPs, where at least one LLP is produced with sufficiently low...

This paper describes measurements of the transverse momentum spectra of W and Z bosons produced in proton–proton collisions at centre-of-mass energies of $$\sqrt{s}=5.02$$ s = 5.02 TeV and $$\sqrt{s}=13$$ s = 13 TeV with the ATLAS experiment at the Large Hadron Collider. Measurements are performed in the electron and muon channels, $$W\rightarrow \...

Measurements of jet cross-section ratios between inclusive bins of jet multiplicity are performed in 140 fb − 1 of proton-proton collisions with s = 13 TeV center-of-mass energy, recorded with the ATLAS detector at CERN’s Large Hadron Collider. These ratios are constructed from double-differential cross-section measurements that are made in bins of...

A bstract Inclusive and differential cross-sections are measured at particle level for the associated production of a top quark pair and a photon ( $$ t\overline{t}\gamma $$ t t ¯ γ ). The analysis is performed using an integrated luminosity of 140 fb − 1 of proton-proton collisions at a centre-of-mass energy of 13 TeV collected by the ATLAS detect...

This paper reports a summary of searches for a fermionic dark matter candidate in the context of theoretical models characterised by a mediator particle exchange in the s -channel. The data sample considered consists of pp collisions delivered by the Large Hadron Collider during its Run 2 at a centre-of-mass energy of $$\sqrt{s} = 13\,\textrm{TeV}$...

A search for the exclusive hadronic decays W ± → π ± γ , W ± → K ± γ , and W ± → ρ ± γ is performed using up to 140 fb − 1 of proton-proton collisions recorded with the ATLAS detector at a center-of-mass energy of s = 13 TeV . If observed, these rare processes would provide a unique test bench for the quantum chromodynamics factorization formalism...

A search for long-lived particles (LLPs) using 140 fb − 1 of p p collision data with s = 13 TeV recorded by the ATLAS experiment at the LHC is presented. The search targets LLPs with masses between 5 and 55 GeV that decay hadronically in the ATLAS inner detector. Benchmark models with LLP pair production from exotic decays of the Higgs boson and mo...

The inclusive cross section for the production of a single top quark in association with a W boson is measured using 140 fb − 1 of proton-proton collision data collected with the ATLAS detector at s = 13 TeV . Events containing two charged leptons and at least one jet identified as originating from a b -quark are selected. A multivariate discrimina...

A bstract A search for a new heavy boson produced via gluon-fusion in the four-lepton channel with missing transverse momentum or jets is performed. The search uses proton-proton collision data equivalent to an integrated luminosity of 139 fb − 1 at a centre-of-mass energy of 13 TeV collected by the ATLAS detector between 2015 and 2018 at the Large...

A search for a new Z ′ gauge boson predicted by L μ − L τ models, based on charged-current Drell–Yan production, p p → W ± ( * ) → Z ′ μ ± ν → μ ± μ ∓ μ ± ν , is presented. The data sample used corresponds to an integrated luminosity of 140 fb − 1 of proton–proton collisions at s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider....

The observation of the electroweak production of a W boson and a photon in association with two jets, using pp collision data at the Large Hadron Collider at a centre of mass energy of $$\sqrt{s}=13$$ s = 13 TeV, is reported. The data were recorded by the ATLAS experiment from 2015 to 2018 and correspond to an integrated luminosity of 140 fb $$^{-1...

A bstract A search for a hypothetical heavy scalar particle, X , decaying into a singlet scalar particle, S , and a Standard Model Higgs boson, H , using 140 fb − 1 of proton-proton collision data at the centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the LHC is presented. The explored mass range is 300 ≤ m X ≤ 1000 GeV and 170...

Pixel sensors in 3D technology equip the outer ends of the staves of the Insertable B Layer (IBL), the innermost layer of the ATLAS Pixel Detector, which was installed before the start of LHC Run 2 in 2015. 3D pixel sensors are expected to exhibit more tolerance to radiation damage and are the technology of choice for the innermost layer in the ATL...

The associated production of Higgs and W bosons via vector-boson fusion is highly sensitive to the relative sign of the Higgs boson couplings to W and Z bosons. In this Letter, two searches for this process are presented, using 140 fb − 1 of proton-proton collision data at s = 13 TeV recorded by the ATLAS detector at the LHC. The first search targe...

The ratio of branching ratios of the W boson to muons and electrons, \(R^{\,\mu /e}_W={{\mathcal {B}}(W\rightarrow \mu \nu )}\)/\({{\mathcal {B}}(W\rightarrow e\nu )}\), has been measured using \(140\,\text{ fb}^{-1}\,\) of pp collision data at \(\sqrt{s}=13\) \(\text {T}\text {e}\hspace{-1.00006pt}\text {V}\) collected with the ATLAS detector at t...

This paper presents a search for exotic decays of the Higgs boson into a pair of new pseudoscalar particles, H → a a , where one pseudoscalar decays into a b -quark pair and the other decays into a τ -lepton pair, in the mass range 12 ≤ m a ≤ 60 GeV . The analysis uses p p collision data at s = 13 TeV collected with the ATLAS detector at the LHC, c...

This paper presents a measurement of the production cross-section of a Z boson in association with b - or c -jets, in proton–proton collisions at $$\sqrt{s} = 13$$ s = 13 TeV with the ATLAS experiment at the Large Hadron Collider using data corresponding to an integrated luminosity of 140 $$\hbox {fb}^{-1}$$ fb - 1 . Inclusive and differential cros...

A search is presented for the pair production of heavy vectorlike quarks (VLQs) that each decay into a W boson and a light quark. This study focuses on events where one W boson decays into leptons and the other into hadrons. The search analyzed 140 fb − 1 of p p collision data with s = 13 TeV , recorded by the ATLAS detector from 2015 to 2018 durin...

This Letter presents the first study of the energy dependence of diboson polarization fractions in W Z → ℓ ν ℓ ′ ℓ ′ ( ℓ , ℓ ′ = e , μ ) production. The dataset used corresponds to an integrated luminosity of 140 fb − 1 of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector. Two fiducial regions with an enha...

This Letter presents results from a combination of searches for Higgs boson pair production using 126 – 140 fb − 1 of proton-proton collision data at s = 13 TeV recorded with the ATLAS detector. At 95% confidence level (CL), the upper limit on the production rate is 2.9 times the standard model (SM) prediction, with an expected limit of 2.4 assumin...

The energy and mass measurements of jets are crucial tasks for the Large Hadron Collider experiments. This paper presents a new calibration method to simultaneously calibrate these quantities for large-radius jets measured with the ATLAS detector using a deep neural network (DNN). To address the specificities of the calibration problem, special los...

A bstract A search for dark mesons originating from strongly-coupled, SU(2) dark flavor symmetry conserving models and decaying gaugephobically to pure Standard Model final states containing top and bottom quarks is presented. The search targets fully hadronic final states and final states with exactly one electron or muon and multiple jets. The an...

A search for Higgs boson pair production via vector-boson fusion is performed in the Lorentz-boosted regime, where a Higgs boson candidate is reconstructed as a single large-radius jet, using 140 fb−1 of proton–proton collision data at Vs=13 TeV recorded by the ATLAS detector at the Large Hadron Collider. Only Higgs boson decays into bottom quark p...

The identification of top quark decays where the top quark has a large momentum transverse to the beam axis, known as top tagging , is a crucial component in many measurements of Standard Model processes and searches for beyond the Standard Model physics at the Large Hadron Collider. Machine learning techniques have improved the performance of top...

A bstract A search is presented for non-resonant Higgs boson pair production, targeting the bbZZ , 4 V ( V = W or Z ), VVττ , 4 τ , γγVV and γγττ decay channels. Events are categorised based on the multiplicity of light charged leptons (electrons or muons), hadronically decaying tau leptons, and photons. The search is based on a data sample of prot...

A bstract A combination of searches for Higgs boson decays into a visible photon and a massless dark photon ( H → γγ d ) is presented using 139 fb − 1 of proton-proton collision data at a centre-of-mass energy of $$ \sqrt{s} $$ s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider. The observed (expected) 95% confidence level upper...

Several processes studied by the ATLAS experiment at the Large Hadron Collider produce low-momentum b -flavored hadrons in the final state. This paper describes the calibration of a dedicated tagging algorithm that identifies b -flavored hadrons outside of hadronic jets by reconstructing the soft secondary vertices originating from their decays. Th...

A search for leptoquark pair production decaying into $$te^- \bar{t}e^+$$ t e - t ¯ e + or $$t\mu ^- \bar{t}\mu ^+$$ t μ - t ¯ μ + in final states with multiple leptons is presented. The search is based on a dataset of pp collisions at $$\sqrt{s}=13~\text {TeV} $$ s = 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider...

A search for the nonresonant production of Higgs boson pairs in the H H → b b ¯ τ + τ − channel is performed using 140 fb − 1 of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. The analysis strategy is optimized to probe anomalous values of the Higgs boson self-coupling...

A search is performed for localized excesses in the low-mass dijet invariant mass distribution, targeting a hypothetical new particle decaying into two jets and produced in association with either a high transverse momentum photon or a jet. The search uses the full Run 2 data sample from LHC proton-proton collisions collected by the ATLAS experimen...

A bstract A search for heavy pseudo-scalar ( A ) and scalar ( H ) Higgs bosons decaying into a top-quark pair ( $$ t\overline{t} $$ t t ¯ ) has been performed with 140 fb − 1 of proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider at a centre-of-mass energy of $$ \sqrt{s} $$ s = 13 TeV. Interference effects be...

A bstract Differential cross-sections for top-quark pair production, inclusively and in association with jets, are measured in pp collisions at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC using an integrated luminosity of 140 fb − 1 . The events are selected with one charged lepton (electron or muon) and at least four jets....

A bstract Measurements of inclusive, differential cross-sections for the production of events with missing transverse momentum in association with jets in proton-proton collisions at $$ \sqrt{s} $$ s = 13 TeV are presented. The measurements are made with the ATLAS detector using an integrated luminosity of 140 fb − 1 and include measurements of dij...

A search is presented for flavour-changing neutral-current interactions involving the top quark, the Higgs boson and an up-type quark ( $$q=u,c$$ q = u , c ) with the ATLAS detector at the Large Hadron Collider. The analysis considers leptonic decays of the top quark along with Higgs boson decays into two $$W$$ W bosons, two $$Z$$ Z bosons or a $$\...

Presented is the search for anomalous Higgs boson decays into two axion-like particles (ALPs) using the full Run 2 data set of $$140\,\text {fb}^{-1}$$ 140 fb - 1 of proton-proton collisions at a centre-of-mass energy of $$13\,\text {TeV}$$ 13 TeV recorded by the ATLAS experiment. The ALPs are assumed to decay into two photons, providing sensitivit...

A bstract This paper presents a search for top-squark pair production in final states with a top quark, a charm quark and missing transverse momentum. The data were collected with the ATLAS detector during LHC Run 2 and correspond to an integrated luminosity of 139 fb − 1 of proton-proton collisions at a centre-of-mass energy of $$ \sqrt{s} $$ s =...

A bstract A measurement of the production of W bosons with opposite electric charges in association with two jets is presented based on 140 fb − 1 of data collected by the ATLAS detector in proton-proton collisions at $$ \sqrt{s} $$ s = 13 TeV. The analysis is sensitive to the scattering of W bosons, which is of particular interest in the ATLAS phy...

A search for charged-lepton-flavor violating μ τ q t ( q = u , c ) interactions is presented, considering both top-quark production and decay. The data analyzed correspond to 140 fb − 1 of proton-proton collisions at a center-of-mass energy of s = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. The analysis targets events cont...