Search results for "transverse momentum [electron]"

showing 3 items of 3 documents

Including resummation in the NLO BK equation

2017

We include a resummation of large transverse momentum logarithms in the next-to-leading order (NLO) Balitsky-Kovchegov equation. The resummed evolution equation is shown to be stable, the evolution speed being significantly reduced by NLO corrections. The contributions from NLO terms that are not enhanced by large logarithms are found to be numerically important close to phenomenologically relevant initial conditions. We numerically determine the value for the constant in the resummed logarithm that includes a maximal part of the full NLO terms in the resummation.

Nuclear and High Energy PhysicsParticle physicsNuclear TheoryLogarithmFOS: Physical sciences01 natural sciencesNuclear Theory (nucl-th)High Energy Physics - Phenomenology (hep-ph)0103 physical sciencesnext-to-leading order (NLO)ResummationNuclear Experiment010306 general physicsNuclear theoryPhysicsta114010308 nuclear & particles physicsHigh Energy Physics::Phenomenologylarge transverse momentum logarithmsBalitsky-Kovchegov equationHigh Energy Physics - PhenomenologyQuantum electrodynamicsTransverse momentumEvolution equationHigh Energy Physics::ExperimentConstant (mathematics)Nuclear and Particle Physics Proceedings
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Measurement of photon?jet transverse momentum correlations in 5.02 TeV Pb + Pb and pp collisions with ATLAS

2019

Jets created in association with a photon can be used as a calibrated probe to study energy loss in the medium created in nuclear collisions. Measurements of the transverse momentum balance between isolated photons and inclusive jets are presented using integrated luminosities of 0.49 nb−1 of Pb + Pb collision data at TeV and 25 pb−1 of pp collision data at TeV recorded with the ATLAS detector at the LHC. Photons with transverse momentum GeV and are paired with all jets in the event that have GeV and pseudorapidity . The transverse momentum balance given by the jet-to-photon ratio, , is measured for pairs with azimuthal opening angle . Distributions of the per-photon jet yield as a function…

PhotonLEAD-LEAD COLLISIONS; PP COLLISIONS; ROOT-S(NN)=2.76 TEV; DEPENDENCEheavy ion: scatteringPhysics::Instrumentation and DetectorsMonte Carlo methodRelativistic heavy ion collisionsphoton–jet transverse momentum correlationsnucl-ex01 natural sciencesHigh Energy Physics - ExperimentDouble Drell–YanSubatomär fysikHigh Energy Physics - Experiment (hep-ex)Double parton-scatteringDEPENDENCESubatomic Physicsscattering [p p][PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]luminositiesCollisions ROOT-S(NN)=2.76 TEVNuclear Experiment (nucl-ex)Nuclear Experimentdimension: 2GeneralLiterature_REFERENCE(e.g.dictionariesencyclopediasglossaries)Nuclear ExperimentMonte CarloComputingMilieux_MISCELLANEOUSQCComputer Science::DatabasesPhysicsJet (fluid)Large Hadron ColliderSettore FIS/01 - Fisica Sperimentalephotonyield [jet]transverse momentum: correlationATLASlcsh:QC1-999:Mathematics and natural scienses: 400::Physics: 430::Nuclear and elementary particle physics: 431 [VDP]medicine.anatomical_structureCERN LHC Coll2 [dimension]nuclear matterLHCLEAD-LEAD COLLISIONSjet: yieldParticle Physics - ExperimentNuclear and High Energy Physicsp p: scatteringenergy loss [parton]530 PhysicsCiências Naturais::Ciências FísicasAstrophysics::High Energy Astrophysical Phenomena:Ciências Físicas [Ciências Naturais]FOS: Physical sciencesddc:500.2LHC ATLAS High Energy Physics[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]jets Nuclear physicsAtlas (anatomy)0103 physical sciencesCalibrationmedicineddc:530RapidityNuclear Physics - Experiment5020 GeV-cms/nucleonHigh Energy Physics010306 general physicsCiencias ExactasFour-lepton productionHiggs golden decay channelPP COLLISIONSScience & Technology010308 nuclear & particles physicshep-exHigh Energy Physics::Phenomenologynucleus:Matematikk og naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP]FísicaNuclear mattercalibrationjet quenching* Automatic Keywords *rapidityExperimental High Energy PhysicsHigh Energy Physics::Experimentparton: energy losscorrelation [transverse momentum]lcsh:Physicsexperimental resultsPhysics Letters B
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Jet fragmentation transverse momentum distributions in pp and p-Pb collisions at √s, √sNN = 5.02 TeV

2021

Jet fragmentation transverse momentum (jT) distributions are measured in proton-proton (pp) and proton-lead (p-Pb) collisions at √sNN = 5.02 TeV with the ALICE experiment at the LHC. Jets are reconstructed with the ALICE tracking detectors and electromagnetic calorimeter using the anti-kT algorithm with resolution parameter R = 0.4 in the pseudorapidity range |η| < 0.25. The jT values are calculated for charged particles inside a fixed cone with a radius R = 0.4 around the reconstructed jet axis. The measured jT distributions are compared with a variety of parton-shower models. Herwig and Pythia 8 based models describe the data well for the higher jT region, while they underestimate the low…

related to the perturbative component of the fragmentation processthe measured trends are successfully described by all models except for Herwig. For the wide componentHerwig and PYTHIA 8 based models slightly underestimate the data for the higher jet transverse momentum region. These measurements set constraints on models of jet fragmentation and hadronisation.Nuclear and High Energy Physicswhile that of the inverse gamma function increases with increasing jet transverse momentum. For the narrow componentHeavy Ion Experimentsand with a Gaussian for lower jT values (called the “narrow component”)hiukkasfysiikkawhile they underestimate the lower jT region. The jT distributions are further characterised by fitting them with a function composed of an inverse gamma function for higher jT values (called the “wide component”)predominantly connected to the hadronisation process. The width of the Gaussian has only a weak dependence on jet transverse momentumJet fragmentation transverse momentum (jT) distributions are measured in proton-proton (pp) and proton-lead (p-Pb) collisions at √sNN = 5.02 TeV with the ALICE experiment at the LHC. Jets are reconstructed with the ALICE tracking detectors and electromagnetic calorimeter using the anti-kT algorithm with resolution parameter R = 0.4 in the pseudorapidity range |η| < 0.25. The jT values are calculated for charged particles inside a fixed cone with a radius R = 0.4 around the reconstructed jet axis. The measured jT distributions are compared with a variety of parton-shower models. Herwig and PYTHIA 8 based models describe the data well for the higher jT region
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