Search results for "photon photon: elastic scattering"

showing 1 items of 1 documents

Observation of light-by-light scattering in ultraperipheral Pb+Pb collisions with the ATLAS detector

2019

This Letter describes the observation of the light-by-light scattering process, γγ→γγ, in Pb+Pb collisions at √sNN=5.02  TeV. The analysis is conducted using a data sample corresponding to an integrated luminosity of 1.73  nb−1, collected in November 2018 by the ATLAS experiment at the LHC. Light-by-light scattering candidates are selected in events with two photons produced exclusively, each with transverse energy EγT>3  GeV and pseudorapidity |ηγ|<2.4, diphoton invariant mass above 6 GeV, and small diphoton transverse momentum and acoplanarity. After applying all selection criteria, 59 candidate events are observed for a background expectation of 12±3 events. The observed excess of events…

Photonheavy ion: scatteringmass spectrum: (2photon)Physics::Instrumentation and Detectorsmeasured [channel cross section]General Physics and Astronomytransverse energy [photon]nucl-ex01 natural sciencesLight scatteringHigh Energy Physics - ExperimentHigh Energy Physics - Experiment (hep-ex)Scattering processPseudorapidities[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Invariant massCollisionsNuclear Experiment (nucl-ex)Nuclear ExperimentNuclear Experimentelastic scattering [photon photon]Physicsphoton: transverse energyproton–proton collisionsLarge Hadron ColliderSettore FIS/01 - Fisica SperimentaleATLAS:Mathematics and natural scienses: 400::Physics: 430::Nuclear and elementary particle physics: 431 [VDP]CERN LHC CollPseudorapidityTransverse momentalight-by-light scatteringLHCchannel cross section: measuredParticle Physics - Experimentrelativistic heavy-ion collisionsjets(2photon) [mass spectrum]Transverse energyCiências Naturais::Ciências Físicas530 PhysicsAstrophysics::High Energy Astrophysical Phenomena:Ciências Físicas [Ciências Naturais]FOS: Physical sciencesATLAS experimentddc:500.2LHC ATLAS High Energy Physicstransverse momentumplanarity[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]Relativistic heavy ions530AcoplanarityNuclear physicsscattering [heavy ion]Delbrück scattering0103 physical sciencesStandard deviationNuclear Physics - Experimentddc:5305020 GeV-cms/nucleonSelection criteria010306 general physicsperipheralCiencias Exactastwo-photon [mass spectrum]Integrated luminosityleadScience & Technologyhep-exrapidity [photon]Scatteringbackground:Matematikk og naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP]Físicaphoton: rapidityElementary Particles and FieldsHigh Energy Physics::Experimentphoton photon: elastic scatteringmass spectrum: two-photonexperimental results
researchProduct