0000000000530354

AUTHOR

Urs Achim Wiedemann

showing 2 related works from this author

QCD Challenges from pp to A-A Collisions

2020

This paper is a write-up of the ideas that were presented, developed and discussed at the third International Workshop on QCD Challenges from pp to A-A, which took place in August 2019 in Lund, Sweden. The goal of the workshop was to focus on some of the open questions in the field and try to come up with concrete suggestions for how to make progress on both the experimental and theoretical sides. The paper gives a brief introduction to each topic and then summarizes the primary results.

Nuclear and High Energy PhysicsNuclear Theorynucl-thFOS: Physical sciencesLibrary scienceHEAVY-ION COLLISIONShiukkasfysiikkaPROTONnucl-exAtomic01 natural sciencesHigh Energy Physics - ExperimentJET PRODUCTIONNuclear Theory (nucl-th)High Energy Physics - Experiment (hep-ex)High Energy Physics - Phenomenology (hep-ph)Particle and Plasma PhysicsDEPENDENCE0103 physical sciencesNuclearNuclear Physics - ExperimentPARTICLE-PRODUCTIONNuclear Experiment (nucl-ex)LONG-RANGE010306 general physicsNuclear ExperimentNuclear theoryParticle Physics - PhenomenologyQuantum chromodynamicsPhysicsELLIPTIC FLOW010308 nuclear & particles physicshep-exPB COLLISIONSMolecularhep-phNuclear & Particles PhysicsANGULAR-CORRELATIONSHigh Energy Physics - PhenomenologySTATISTICAL HADRONIZATIONNuclear Physics - TheoryydinfysiikkaParticle Physics - Experiment
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The fragility of high- hadron spectra as a hard probe

2004

We study the suppression of high-pT hadron spectra in nuclear collisions, supplementing the perturbative QCD factorized formalism with radiative parton energy loss. We find that the nuclear modification factor which quantifies the degree of suppression, is almost pT-independent both for RHIC (in agreement with data) and for the LHC. This is a consequence of the shape of the partonic pT-spectrum in elementary collisions which implies that for the same value of the nuclear modification factor at higher pT, an increasingly smaller fraction of parton energy loss is needed. When the values of the time-averaged transport coefficient exceed 5 GeV^2/fm, the nuclear modification factor gradually los…

PhysicsNuclear and High Energy PhysicsParticle physicsLarge Hadron ColliderOpacity010308 nuclear & particles physicsTransport coefficientHigh Energy Physics::PhenomenologyHadronElliptic flowFOS: Physical sciencesPerturbative QCDParton01 natural sciencesNuclear physicsHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)0103 physical sciencesRadiative transferHigh Energy Physics::ExperimentNuclear Experiment010306 general physicsParticle Physics - PhenomenologyNuclear Physics A
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