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69 papers found.
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Measurement of the Drell-Yan triple-differential cross section in pp collisions at \( \sqrt{s}=8 \) TeV

This paper presents a measurement of the triple-differential cross section for the Drell-Yan process Z/γ * → ℓ + ℓ − where ℓ is an electron or a muon. The measurement is performed for invariant masses of the lepton pairs, m ℓℓ , between 46 and 200 GeV using a sample of 20.2 fb−1 of pp collisions data at a centre-of-mass energy of \( \sqrt{s}=8 \) TeV collected by the ATLAS detector ...

Evidence for the \( H\to b\overline{b} \) decay with the ATLAS detector

A search for the decay of the Standard Model Higgs boson into a \( b\overline{b} \) pair when produced in association with a W or Z boson is performed with the ATLAS detector. The analysed data, corresponding to an integrated luminosity of 36.1 fb−1, were collected in proton-proton collisions in Run 2 of the Large Hadron Collider at a centre-of-mass energy of 13 TeV. Final states ...

Measurement of b-hadron pair production with the ATLAS detector in proton-proton collisions at \( \sqrt{s}=8 \) TeV

A measurement of b-hadron pair production is presented, based on a data set corresponding to an integrated luminosity of 11.4 fb−1 of proton-proton collisions recorded at \( \sqrt{s}=8 \) TeV with the ATLAS detector at the LHC. Events are selected in which a b-hadron is reconstructed in a decay channel containing J/ψ → μμ, and a second b-hadron is reconstructed in a decay channel ...

Search for supersymmetry in events with b-tagged jets and missing transverse momentum in pp collisions at \( \sqrt{s}=13 \) TeV with the ATLAS detector

A search for the supersymmetric partners of the Standard Model bottom and top quarks is presented. The search uses 36.1 fb−1 of pp collision data at \( \sqrt{s}=13 \) TeV collected by the ATLAS experiment at the Large Hadron Collider. Direct production of pairs of bottom and top squarks (\( {\overline{b}}_1 \) and \( {\overline{t}}_1 \)) is searched for in final states with ...

Measurement of lepton differential distributions and the top quark mass in \(t\bar{t}\) production in pp collisions at \(\sqrt{s}=8\) TeV with the ATLAS detector

This paper presents single lepton and dilepton kinematic distributions measured in dileptonic \(t\bar{t}\) events produced in 20.2\(\hbox {fb}^{-1}\) of \(\sqrt{s}=8\) TeV pp collisions recorded by the ATLAS experiment at the LHC. Both absolute and normalised differential cross-sections are measured, using events with an opposite-charge \(e\mu \) pair and one or two b-tagged jets. ...

Performance of the ATLAS track reconstruction algorithms in dense environments in LHC Run 2

With the increase in energy of the Large Hadron Collider to a centre-of-mass energy of 13 \(\text {TeV}\) for Run 2, events with dense environments, such as in the cores of high-energy jets, became a focus for new physics searches as well as measurements of the Standard Model. These environments are characterized by charged-particle separations of the order of the tracking ...

Correction to: Identification and rejection of pile-up jets at high pseudorapidity with the ATLAS detector

Unfortunately, in the original version of this article the copyright holder was wrong in the HTML. The original article has been corrected.

Search for pair production of heavy vector-like quarks decaying to high-p T W bosons and b quarks in the lepton-plus-jets final state in pp collisions at \( \sqrt{s}=13 \) TeV with the ATLAS detector

A search is presented for the pair production of heavy vector-like T quarks, primarily targeting the T quark decays to a W boson and a b-quark. The search is based on 36.1 fb−1 of pp collisions at \( \sqrt{s}=13 \) TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. Data are analysed in the lepton-plus-jets final state, including at least one ...

Measurement of inclusive and differential cross sections in the H → ZZ * → 4ℓ decay channel in pp collisions at \( \sqrt{s}=13 \) TeV with the ATLAS detector

Inclusive and differential fiducial cross sections of Higgs boson production in proton-proton collisions are measured in the H → ZZ * → 4ℓ decay channel. The proton-proton collision data were produced at the Large Hadron Collider at a centre-of-mass energy of 13 TeV and recorded by the ATLAS detector in 2015 and 2016, corresponding to an integrated luminosity of 36.1 fb−1. The ...

Search for top quark decays t → qH, with H → γγ, in \( \sqrt{s}=13 \) TeV pp collisions using the ATLAS detector

This article presents a search for flavour-changing neutral currents in the decay of a top quark into an up-type (q = c, u) quark and a Higgs boson, where the Higgs boson decays into two photons. The proton-proton collision data set analysed amounts to 36.1 fb−1 at \( \sqrt{s}=13 \) TeV collected by the ATLAS experiment at the LHC. Top quark pair events are searched for, where one ...

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. ...

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 supersymmetry in final states with two same-sign or three leptons and jets using 36 fb−1 of \( \sqrt{s}=13 \) TeV pp collision data with the ATLAS detector

A search for strongly produced supersymmetric particles using signatures involving multiple energetic jets and either two isolated same-sign leptons (e or μ), or at least three isolated leptons, is presented. The analysis relies on the identification of b-jets and high missing transverse momentum to achieve good sensitivity. A data sample of proton-proton collisions at \( ...

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 \(|\eta |>2.5\). ...

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 ...