572 hasil untuk "ATLAS Collaboration"
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Artikel Jurnal
Precision measurement of the $$B^{0}$$ B 0 meson lifetime using $$B^{0}\rightarrow J/\psi K^{{* 0}}$$ B 0 → J / ψ K ∗ 0 decays with the ATLAS detector
…luminosity of $$ 140~\mathrm {fb^{-1}} $$ 140 fb - 1 recorded by the ATLAS detector at the LHC is presented. The measured effective lifetime is $$ \tau = 1.5053\pm 0.0012~\mathrm {(stat.)} \pm 0.0035~\mathrm {(syst.)~ps}. $$ τ = 1.5053 ± 0.0012 ( stat . ) ± 0.0035 ( syst . ) ps . The average decay…
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Artikel Jurnal
Calibration of the jet energy scale and resolution of small-radius jets using semileptonic $$t\bar{t}$$ t t ¯ events with the ATLAS detector
Abstract A measurement of correction factors for the hadronic jet energy scale and resolution in the ATLAS detector is presented. These correction factors account for differences between simulated and observed data. They are obtained by analysing a selection of top quark events collected in…
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Artikel Jurnal
Software and computing for Run 3 of the ATLAS experiment at the LHC
Abstract 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…
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Artikel Jurnal
A precise measurement of the jet energy scale derived from single-particle measurements and in situ techniques in proton–proton collisions at $$\sqrt{s}=$$ s = 13 TeV with the ATLAS detector
…collisions at $$\sqrt{s} = 13$$ s = 13 TeV collected with the ATLAS detector during Run 2 at the Large Hadron Collider. The jet calibration uncertainty for anti- $$k_T$$ k T jets with a jet radius parameter of R $$_\textrm{jet} = 0.4$$ jet = 0.4 and in the central jet rapidity region is about 2.5%…
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Artikel Jurnal
Precision calibration of calorimeter signals in the ATLAS experiment using an uncertainty-aware neural network
The ATLAS experiment at the Large Hadron Collider explores the use of modern neural networks for a multi-dimensional calibration of its calorimeter signal defined by clusters of topologically connected cells (topo-clusters). The Bayesian neural network (BNN) approach not only yields a continuous…
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Artikel Jurnal
A continuous calibration of the ATLAS flavour-tagging classifiers via optimal transportation maps
Abstract A calibration of the ATLAS flavour-tagging algorithms using a new calibration procedure based on optimal transportation maps is presented. Simultaneous, continuous corrections to the b-jet, c-jet, and light-flavour jet classification probabilities from jet-tagging algorithms in simulation…
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Artikel Jurnal
Search for heavy neutral leptons in decays of W bosons produced in 13 TeV pp collisions using prompt signatures in the ATLAS detector
…- 1 of 13 TeV proton–proton collisions at the LHC, reconstructed in the ATLAS experiment, are used to search for heavy neutral leptons produced through their mixing with muon or electron neutrinos in a scenario with lepton number violation. The search is conducted using prompt leptonic decay…
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Artikel Jurnal
Energy scale and resolution for anti- $$k_t$$ k t jets with radius parameters $$R=0.2$$ R = 0.2 and 0.6 measured in proton-proton collisions at $$\sqrt{s} = 13$$ s = 13 TeV with the ATLAS detector
…jets with radius parameters $$R=0.2$$ R = 0.2 and 0.6, obtained using the ATLAS detector. The results are based on $$37~\text {fb}^{-1}$$ 37 fb - 1 of proton–proton collision data from the Large Hadron Collider at a centre-of-mass energy of $$\sqrt{s}=13$$ s = 13 TeV. A new in situ method for…
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Artikel Jurnal
Search for $$t\bar{t}H/A \rightarrow t\bar{t}t\bar{t}$$ t t ¯ H / A → t t ¯ t t ¯ production in proton–proton collisions at $$\sqrt{s}=13$$ s = 13 $$\text {TeV}$$ TeV with the ATLAS detector
…¯ pair. The full LHC Run 2 proton–proton collision data collected by the ATLAS experiment is used, corresponding to an integrated luminosity of $$139~\text {fb}^{-1}.$$ 139 fb - 1 . Events are selected requiring exactly one or two opposite-charge electrons or muons. Data-driven corrections are…
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Artikel Jurnal
Measurement of $$W^{\pm }$$ W ± -boson differential cross-sections in proton–proton collisions with low pile-up data at $$\sqrt{s} = 5.02$$ s = 5.02 TeV and $$13\,\hbox {TeV}$$ 13 TeV with the ATLAS detector
…collected in dedicated runs at reduced instantaneous luminosity with the ATLAS detector at the Large Hadron Collider, correspond to integrated luminosities of 255 pb $$^{-1}$$ - 1 at 5.02 TeV and 338 pb $$^{-1}$$ - 1 at 13 TeV. The measurements are in agreement with Standard-Model predictions…
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Artikel Jurnal
Measurement of the associated production of a top-antitop-quark pair and a Higgs boson decaying into a $$b\bar{b}$$ b b ¯ pair in pp collisions at $$\sqrt{s}=13$$ s = 13 TeV using the ATLAS detector at the LHC
…of 13 $$\text {TeV}$$ TeV proton–proton collision data collected with the ATLAS detector at the Large Hadron Collider. The final states with one or two electrons or muons are employed. An excess of events over the expected background is found with an observed (expected) significance of 4.6 (5.4)…
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Artikel Jurnal
Reconstruction and identification of pairs of collimated $$\tau $$ τ -leptons decaying hadronically using $$\sqrt{s}=13$$ s = 13 TeV pp collision data with the ATLAS detector
…collision data at $$\sqrt{s}=13$$ s = 13 TeV collected by the ATLAS experiment at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of $$139\,\text{ fb}^{-1}$$ 139 fb - 1 . The resulting data-to-simulation scale factors are close to unity with uncertainties…
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Artikel Jurnal
Improved reconstruction of highly boosted $$\tau $$ τ -lepton pairs in the $$\tau \tau \rightarrow (\mu \nu _{\mu }\nu _{\tau })(\text {hadrons}+\nu _{\tau })$$ τ τ → ( μ ν μ ν τ ) ( hadrons + ν τ ) decay channels with the ATLAS detector
Abstract This paper presents a new $$\tau $$ τ -lepton reconstruction and identification procedure at the ATLAS detector at the Large Hadron Collider, which leads to significantly improved performance in the case of physics processes where a highly boosted pair of $$\tau $$ τ -leptons is produced…
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Artikel Jurnal
Measurement of the Lund jet plane in hadronic decays of top quarks and W bosons with the ATLAS detector
…- 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 showers and hadron formation. The observable is constructed from…
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Artikel Jurnal
Search for light neutral particles decaying promptly into collimated pairs of electrons or muons in pp collisions at $$\sqrt{s}$$ s = 13 $$\text {T}\text {e}\hspace{-1.00006pt}\text {V}$$ Te V with the ATLAS detector
…is based on $$140~\hbox {fb}^{-1}$$ 140 fb - 1 of data collected with the ATLAS detector at the Large Hadron Collider from proton-proton collisions at a center-of-mass energy of 13 $$\text {T}\text {e}\hspace{-1.00006pt}\text {V}$$ Te V . Events with collimated pairs of electrons or muons are…
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Artikel Jurnal
Underlying-event studies with strange hadrons in pp collisions at $$\sqrt{s} = 13$$ s = 13 TeV with the ATLAS detector
…, $$\Lambda $$ 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 displaced two-particle vertices corresponding to the decay modes…
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Artikel Jurnal
Search for a new pseudoscalar decaying into a pair of bottom and antibottom quarks in top-associated production in $$\sqrt{s}=13$$ s = 13 TeV proton–proton collisions with the ATLAS detector
Abstract A search for a pseudoscalar a produced in association with a top-quark pair, or in association with a single top quark plus a W boson, with the pseudoscalar decaying into b-quarks ( $$a\rightarrow b\bar{b}$$ a → b b ¯ ), is performed using the full Run 2 data sample using a dileptonic…