0000000000789786

AUTHOR

R. Härtel

showing 3 related works from this author

Charged-particle multiplicities in pp interactions at s=900 GeV measured with the ATLAS detector at the LHC

2010

The first measurements from proton-proton collisions recorded with the ATLAS detector at the LHC are presented. Data were collected in December 2009 using a minimum-bias trigger during collisions at a centre-of-mass energy of 900 GeV. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity, and the relationship between mean transverse momentum and charged-particle multiplicity are measured for events with at least one charged particle in the kinematic range vertical bar eta vertical bar 500 MeV. The measurements are compared to Monte Carlo models of proton-proton collisions and to results from other experiments at the same centre-of-mass energy. The charg…

PhysicsNuclear and High Energy PhysicsParticle physicsLarge Hadron Collider010308 nuclear & particles physicsAtlas detectorMonte Carlo methodMultiplicity (mathematics)01 natural sciences7. Clean energyCharged particleNuclear physicsMinimum biasPseudorapidity0103 physical sciencesTransverse momentumHigh Energy Physics::ExperimentNuclear Experiment010306 general physicsPhysics Letters B
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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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