0000000000749216

AUTHOR

Robert Harper

showing 3 related works from this author

Measurement of the inclusive isolated prompt photon cross section inppcollisions ats=7  TeVwith the ATLAS detector

2011

A measurement of the cross section for the inclusive production of isolated prompt photons in pp collisions at a center-of-mass energy root s = 7 TeV is presented. The measurement covers the pseudorapidity ranges vertical bar eta(gamma)vertical bar < 1: 37 and 1: 52 <= vertical bar eta(gamma)vertical bar < 1: 81 in the transverse energy range 15 <= E-T(gamma) < 100 GeV. The results are based on an integrated luminosity of 880 nb(-1), collected with the ATLAS detector at the Large Hadron Collider. Photon candidates are identified by combining information from the calorimeters and from the inner tracker. Residual background in the selected sample is estimated from data based on the observed d…

PhysicsNuclear and High Energy PhysicsParticle physicsPhotonLarge Hadron Collider010308 nuclear & particles physicsPerturbative QCDElementary particleHERAKinetic energy7. Clean energy01 natural sciencesNuclear physicsMassless particlePseudorapidity0103 physical sciencesHigh Energy Physics::ExperimentNuclear Experiment010306 general physicsPhysical Review D
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Search for quark contact interactions in dijet angular distributions in pp collisions at s=7 TeV measured with the ATLAS detector

2011

Dijet angular distributions from the first LHC pp collisions at center-of-mass energy sqrt(s) = 7 TeV have been measured with the ATLAS detector. The dataset used for this analysis represents an integrated luminosity of 3.1 pb-1. Dijet $\chi$ distributions and centrality ratios have been measured up to dijet masses of 2.8 TeV, and found to be in good agreement with Standard Model predictions. Analysis of the $\chi$ distributions excludes quark contact interactions with a compositeness scale $\Lambda$ below 3.4 TeV, at 95% confidence level, significantly exceeding previous limits.

QuarkPhysicsNuclear and High Energy PhysicsParticle physicsLuminosity (scattering theory)Large Hadron ColliderScale (ratio)010308 nuclear & particles physicsAtlas detectorAstrophysics::High Energy Astrophysical PhenomenaHigh Energy Physics::Phenomenology7. Clean energy01 natural sciencesStandard ModelNuclear physicsmedicine.anatomical_structureAtlas (anatomy)0103 physical sciencesmedicineHigh Energy Physics::Experiment010306 general physicsPhysics Letters B
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Measurement of underlying event characteristics using charged particles inppcollisions ats=900  GeVand 7 TeV with the ATLAS detector

2011

Measurements of charged particle distributions, sensitive to the underlying event, have been performed with the ATLAS detector at the LHC. The measurements are based on data collected using a minimum-bias trigger to select proton-proton collisions at center-of-mass energies of 900 GeV and 7 TeV. The "underlying event" is defined as those aspects of a hadronic interaction attributed not to the hard scattering process, but rather to the accompanying interactions of the rest of the proton. Three regions are defined in azimuthal angle with respect to the highest transverse momentum charged particle in the event, such that the region transverse to the dominant momentum-flow is most sensitive to …

PhysicsNuclear and High Energy PhysicsParticle physicsLarge Hadron ColliderProton010308 nuclear & particles physicsMonte Carlo methodHadron01 natural sciencesCharged particleNuclear physicsTransverse planemedicine.anatomical_structureAtlas (anatomy)0103 physical sciencesmedicineNuclear Experiment010306 general physicsEvent (particle physics)Physical Review D
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