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416 Result(s)
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Article
Measurement of prompt photons with associated jets in photoproduction at HERA
The photoproduction of prompt photons, together with an accompanying jet, has been studied in ep collisions at a centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity o...
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Article
Search for stop production in R-parity-violating supersymmetry at HERA
A search for stop production in R-parity-violating supersymmetry has been performed in e+p interactions with the ZEUS detector at HERA, using an integrated luminosity of 65 pb-1. At HERA, the R-parity-violating c...
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Article
Diffractive photoproduction of D*±(2010) at HERA
Diffractive photoproduction of D*±(2010) mesons was measured with the ZEUS detector at the ep collider HERA, using an integrated luminosity of 78.6 pb-1. The D* mesons were reconstructed in the kinematic range: t...
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Measurement of azimuthal asymmetries in neutral current deep inelastic scattering at HERA
The distribution of the azimuthal angle of charged and neutral hadrons relative to the lepton plane has been studied for neutral current deep inelastic ep scattering using an integrated luminosity of 45 pb-1 take...
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Article
Dijet production in diffractive deep inelastic scattering at HERA
The production of dijets in diffractive deep inelastic scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 61 pb-1. The dijet cross section has been measured for virtuali...
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Article
Open AccessPerformance of the ATLAS detector using first collision data
More than half a million minimum-bias events of LHC collision data were collected by the ATLAS experiment in December 2009 at centre-of-mass energies of 0.9 TeV and 2.36 TeV. This paper reports on studies of t...
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Open AccessThe ATLAS Inner Detector commissioning and calibration
The ATLAS Inner Detector is a composite tracking system consisting of silicon pixels, silicon strips and straw tubes in a 2 T magnetic field. Its installation was completed in August 2008 and the detector took...
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Article
Open AccessMeasurement of the W → ℓν and Z/γ * → ℓℓ production cross sections in proton-proton collisions at \( \sqrt {s} = 7\;{\text{TeV}} \) with the ATLAS detector
First measurements of the W → ℓν and Z/γ * → ℓℓ (ℓ = e, μ) production cross sections in proton-proton collisions at
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Open AccessMeasurement of inclusive jet and dijet cross sections in proton-proton collisions at 7 TeV centre-of-mass energy with the ATLAS detector
Jet cross sections have been measured for the first time in proton-proton collisions at a centre-of-mass energy of 7 TeV using the ATLAS detector. The measurement uses an integrated luminosity of 17 nb−1 recorded...
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Measurement of the top quark-pair production cross section with ATLAS in pp collisions at \(\sqrt{s}=7\) TeV
A measurement of the production cross-section for top quark pairs ( \(t\bar{t}\) ) in pp collisions at ...
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Article
Open AccessLuminosity determination in pp collisions at \(\sqrt{s} = 7\) TeV using the ATLAS detector at the LHC
Measurements of luminosity obtained using the ATLAS detector during early running of the Large Hadron Collider (LHC) at \(\sqrt{s} = 7\) ...
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Open AccessMeasurements of underlying-event properties using neutral and charged particles in pp collisions at \(\sqrt{s}=900\) GeV and \(\sqrt{s}=7\) TeV with the ATLAS detector at the LHC
We present first measurements of charged and neutral particle-flow correlations in pp collisions using the ATLAS calorimeters. Data were collected in 2009 and 2010 at centre-of-mass energies of 900 GeV and 7 TeV....
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Article
Open AccessSearch for new physics with same-sign isolated dilepton events with jets and missing transverse energy at the LHC
The results of searches for new physics in events with two same-sign isolated leptons, hadronic jets, and missing transverse energy in the final state are presented. The searches use an integrated luminosity o...
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Open AccessSearch for supersymmetric particles in events with lepton pairs and large missing transverse momentum in \(\sqrt{s}=7~\mbox{TeV}\) proton–proton collisions with the ATLAS experiment
Results are presented of searches for the production of supersymmetric particles decaying into final states with missing transverse momentum and exactly two isolated leptons in
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Open AccessSearch for an excess of events with an identical flavour lepton pair and significant missing transverse momentum in \(\sqrt{s}=7\) TeV proton–proton collisions with the ATLAS detector
Results are presented of a search for particles decaying into final states with significant missing transverse momentum and exactly two identical flavour leptons (e, μ) of opposite charge in
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Article
Open AccessMeasurement of the \( {{\rm t}\bar{\rm t}} \) production cross section and the top quark mass in the dilepton channel in pp collisions at \( \sqrt {s} = 7 \) TeV
The \( {{\rm t}\bar{\rm t}} \) production cross section and top quark mass are measured in proton-proton collisions at
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Article
Open AccessCharged particle transverse momentum spectra in pp collisions at \( \sqrt {s} = 0.9 \) and 7 TeV
The charged particle transverse momentum (p T) spectra are presented for pp collisions at \( \sqrt {s} = 0.9 \) ...
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Article
Open AccessSearch for new physics with jets and missing transverse momentum in pp collisions at \( \sqrt {s} = 7 \) TeV
A search for new physics is presented based on an event signature of at least three jets accompanied by large missing transverse momentum, using a data sample corresponding to an integrated luminosity of 36 pb−1 ...
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Article
Open AccessSearch for supersymmetry in pp collisions at \( \sqrt {s} = 7 \) TeV in events with a single lepton, jets, and missing transverse momentum
Results are reported from a search for physics beyond the standard model in proton-proton collisions at a center-of-mass energy of 7 TeV, focusing on the signature with a single, isolated, high-transverse-mome...
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Article
Open AccessMeasurement of dijet production with a veto on additional central jet activity in pp collisions at \( \sqrt {s} = 7 \) TeV using the ATLAS detector
A measurement of jet activity in the rapidity interval bounded by a dijet system is presented. Events are vetoed if a jet with transverse momentum greater than 20 GeV is found between the two boundary jets. Th...