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58 papers found.
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Identification and rejection of pile-up jets at high pseudorapidity with the ATLAS detector

The rejection of forward jets originating from additional proton–proton interactions (pile-up) is crucial for a variety of physics analyses at the LHC, including Standard Model measurements and searches for physics beyond the Standard Model. The identification of such jets is challenging due to the lack of track and vertex information in the pseudorapidity range \(|\eta |>2.5\). ...

Measurement of the inclusive jet cross-sections in proton-proton collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector

Inclusive jet production cross-sections are measured in proton-proton collisions at a centre-of-mass energy of \( \sqrt{s}=8 \) TeV recorded by the ATLAS experiment at the Large Hadron Collider at CERN. The total integrated luminosity of the analysed data set amounts to 20.2 fb−1. Double-differential cross-sections are measured for jets defined by the anti-k t jet clustering ...

Search for new phenomena in a lepton plus high jet multiplicity final state with the ATLAS experiment using \( \sqrt{s}=13 \) TeV proton-proton collision data

A search for new phenomena in final states characterized by high jet multiplicity, an isolated lepton (electron or muon) and either zero or at least three b-tagged jets is presented. The search uses 36.1 fb−1 of \( \sqrt{s}=13 \) TeV proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider in 2015 and 2016. The dominant sources of background are ...

Top-quark mass measurement in the all-hadronic \( t\overline{t} \) decay channel at \( \sqrt{s}=8 \) TeV with the ATLAS detector

The top-quark mass is measured in the all-hadronic top-antitop quark decay channel using proton-proton collisions at a centre-of-mass energy of \( \sqrt{s}=8 \) TeV with the ATLAS detector at the CERN Large Hadron Collider. The data set used in the analysis corresponds to an integrated luminosity of 20.2 fb−1. The large multi-jet background is modelled using a data-driven method. ...

Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in \( \sqrt{s}=13 \) TeV pp collisions with the ATLAS detector

A search for direct top squark pair production resulting in events with either a same-flavour opposite-sign dilepton pair with invariant mass compatible with a Z boson or a pair of jets compatible with a Standard Model (SM) Higgs boson (h) is presented. Requirements on the missing transverse momentum, together with additional selections on leptons, jets, jets identified as ...

Fiducial, total and differential cross-section measurements of t-channel single top-quark production in pp collisions at 8 TeV using data collected by the ATLAS detector

Detailed measurements of t-channel single top-quark production are presented. They use 20.2 fb\(^{-1}\) of data collected by the ATLAS experiment in proton–proton collisions at a centre-of-mass energy of 8 TeV at the LHC. Total, fiducial and differential cross-sections are measured for both top-quark and top-antiquark production. The fiducial cross-section is measured with a ...

Measurement of \(WW/WZ \rightarrow \ell \nu q q^{\prime }\) production with the hadronically decaying boson reconstructed as one or two jets in pp collisions at \(\sqrt{s} =8~\text {TeV}\) with ATLAS, and constraints on anomalous gauge couplings

This paper presents a study of the production of WW or WZ boson pairs, with one W boson decaying to \(e\nu \) or \(\mu \nu \) and one W or Z boson decaying hadronically. The analysis uses \(20.2~\text{ fb }^{-1}\) of \(\sqrt{s} =8~\text {TeV}\) pp collision data, collected by the ATLAS detector at the Large Hadron Collider. Cross-sections for WW / WZ production are measured in ...

Measurement of the k t splitting scales in Z → ℓℓ events in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector

A measurement of the splitting scales occuring in the k t jet-clustering algorithm is presented for final states containing a Z boson. The measurement is done using 20.2 fb−1 of proton-proton collision data collected at a centre-of-mass energy of \( \sqrt{s}=8 \) TeV by the ATLAS experiment at the LHC in 2012. The measurement is based on chargedparticle track information, which is ...

Search for pair production of vector-like top quarks in events with one lepton, jets, and missing transverse momentum in \( \sqrt{s}=13 \) TeV pp collisions with the ATLAS detector

The results of a search for vector-like top quarks using events with exactly one lepton, at least four jets, and large missing transverse momentum are reported. The search is optimised for pair production of vector-like top quarks in the Z(→νν) t + X decay channel. LHC pp collision data at a centre-of-mass energy of \( \sqrt{s}=13 \) TeV recorded by the ATLAS detector in 2015 and ...

Jet reconstruction and performance using particle flow with the ATLAS Detector

This paper describes the implementation and performance of a particle flow algorithm applied to 20.2 fb\(^{-1}\) of ATLAS data from 8 TeV proton–proton collisions in Run 1 of the LHC. The algorithm removes calorimeter energy deposits due to charged hadrons from consideration during jet reconstruction, instead using measurements of their momenta from the inner tracker. This improves ...

Measurements of electroweak \(Wjj \) production and constraints on anomalous gauge couplings with the ATLAS detector

Measurements of the electroweak production of a W boson in association with two jets at high dijet invariant mass are performed using \(\sqrt{s} =\) 7 and 8 \(\text {TeV}\) proton–proton collision data produced by the Large Hadron Collider, corresponding respectively to 4.7 and 20.2 fb\(^{-1}\) of integrated luminosity collected by the ATLAS detector. The measurements are sensitive ...

Studies of Zγ production in association with a high-mass dijet system in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector

The production of a Z boson and a photon in association with a high-mass dijet system is studied using 20.2 fb−1 of proton-proton collision data at a centre-of-mass energy of \( \sqrt{s}=8 \) TeV recorded with the ATLAS detector in 2012 at the Large Hadron Collider. Final states with a photon and a Z boson decaying into a pair of either electrons, muons, or neutrinos are analysed. ...

Measurement of multi-particle azimuthal correlations in pp, p + Pb and low-multiplicity Pb + Pb collisions with the ATLAS detector

Multi-particle cumulants and corresponding Fourier harmonics are measured for azimuthal angle distributions of charged particles in \(pp\) collisions at \(\sqrt{s}\) = 5.02 and 13 TeV and in \(p\) + Pb collisions at \(\sqrt{s_{_\text {NN}}}\) = 5.02 TeV, and compared to the results obtained for low-multiplicity \(\mathrm{Pb}~+~\mathrm{Pb}\) collisions at \(\sqrt{s_{_\text {NN}}}\) ...

Search for dark matter at \(\sqrt{s}=13~\mathrm{TeV}\) in final states containing an energetic photon and large missing transverse momentum with the ATLAS detector

Results of a search for physics beyond the Standard Model in events containing an energetic photon and large missing transverse momentum with the ATLAS detector at the Large Hadron Collider are reported. As the number of events observed in data, corresponding to an integrated luminosity of 36.1 fb\(^{-1}\) of proton–proton collisions at a centre-of-mass energy of ...

Precision measurement and interpretation of inclusive \(W^+\) , \(W^-\) and \(Z/\gamma ^*\) production cross sections with the ATLAS detector

High-precision measurements by the ATLAS Collaboration are presented of inclusive \(W^+ \rightarrow \ell ^+\nu \), \(W^- \rightarrow \ell ^-\bar{\nu }\) and \(Z/\gamma ^* \rightarrow \ell \ell \) (\(\ell =e,\mu \)) Drell–Yan production cross sections at the LHC. The data were collected in proton–proton collisions at \(\sqrt{s} = 7\,\text {TeV}\) with an integrated luminosity of ...

Measurements of the production cross section of a \(Z\) boson in association with jets in pp collisions at \(\sqrt{s} = 13\) TeV with the ATLAS detector

Measurements of the production cross section of a \(Z\) boson in association with jets in proton–proton collisions at \(\sqrt{s} = 13\) TeV are presented, using data corresponding to an integrated luminosity of 3.16 fb\(^{-1}\) collected by the ATLAS experiment at the CERN Large Hadron Collider in 2015. Inclusive and differential cross sections are measured for events containing a ...

Measurement of jet fragmentation in Pb+Pb and pp collisions at \(\sqrt{{s_\mathrm{NN}}} = 2.76\) TeV with the ATLAS detector at the LHC

The distributions of transverse momentum and longitudinal momentum fraction of charged particles in jets are measured in Pb+Pb and pp collisions with the ATLAS detector at the LHC. The distributions are measured as a function of jet transverse momentum and rapidity. The analysis utilises an integrated luminosity of 0.14 nb\(^{-1}\) of Pb+Pb data and 4.0 pb\(^{-1}\) of pp data ...

Measurements of top-quark pair differential cross-sections in the \(e\mu \) channel in pp collisions at \(\sqrt{s} = 13\) TeV using the ATLAS detector

This article presents measurements of \(t\bar{t}\) differential cross-sections in a fiducial phase-space region, using an integrated luminosity of 3.2 fb\(^{-1}\) of proton–proton data at a centre-of-mass energy of \(\sqrt{s} = 13\) TeV recorded by the ATLAS experiment at the LHC in 2015. Differential cross-sections are measured as a function of the transverse momentum and absolute ...

Performance of the ATLAS trigger system in 2015

During 2015 the ATLAS experiment recorded \(3.8\,{\mathrm{fb}}^{-1}\) of proton–proton collision data at a centre-of-mass energy of \(13\,{\mathrm{TeV}}\). The ATLAS trigger system is a crucial component of the experiment, responsible for selecting events of interest at a recording rate of approximately 1 kHz from up to 40 MHz of collisions. This paper presents a short overview of ...

Reconstruction of primary vertices at the ATLAS experiment in Run 1 proton–proton collisions at the LHC

This paper presents the method and performance of primary vertex reconstruction in proton–proton collision data recorded by the ATLAS experiment during Run 1 of the LHC. The studies presented focus on data taken during 2012 at a centre-of-mass energy of \(\sqrt{s} = 8\) TeV. The performance has been measured as a function of the number of interactions per bunch crossing over a wide ...