Search results for "parton distribution functions"

showing 4 items of 14 documents

EPPS16: Nuclear parton distributions with LHC data

2017

We introduce a global analysis of collinearly factorized nuclear parton distribution functions (PDFs) including, for the first time, data constraints from LHC proton-lead collisions. In comparison to our previous analysis, EPS09, where data only from charged-lepton-nucleus deep inelastic scattering (DIS), Drell-Yan (DY) dilepton production in proton-nucleus collisions and inclusive pion production in deuteron-nucleus collisions were the input, we now increase the variety of data constraints to cover also neutrino-nucleus DIS and low-mass DY production in pion-nucleus collisions. The new LHC data significantly extend the kinematic reach of the data constraints. We now allow much more freedom…

QuarkParticle physicsPhysics and Astronomy (miscellaneous)Nuclear TheoryNuclear TheoryFOS: Physical sciencesPartonhiukkasfysiikka114 Physical sciences01 natural sciences7. Clean energyHigh Energy Physics - ExperimentNuclear Theory (nucl-th)High Energy Physics - Experiment (hep-ex)High Energy Physics - Phenomenology (hep-ph)PionINELASTIC MUON SCATTERINGpartonit0103 physical sciencesNuclear Experiment (nucl-ex)010306 general physicsNuclear ExperimentPLUS PB COLLISIONSEngineering (miscellaneous)Nuclear ExperimentPhysicsGauge bosonnuclear partonsLarge Hadron Collider010308 nuclear & particles physicsLEADING ORDERHigh Energy Physics::PhenomenologyLEPTON CHARGE ASYMMETRYSTRUCTURE-FUNCTION RATIOSDeep inelastic scatteringPPB COLLISIONSGluonnuclear parton distribution functionsHigh Energy Physics - PhenomenologyDIMUON PRODUCTIONPERTURBATION-THEORYJET CROSS-SECTIONSHigh Energy Physics::ExperimentHADRON-COLLISIONSRegular Article - Theoretical PhysicsNeutrino
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First global next-to-leading order determination of diffractive parton distribution functions and their uncertainties within the {\tt xFitter} framew…

2018

We present {\tt GKG18-DPDFs}, a next-to-leading order (NLO) QCD analysis of diffractive parton distribution functions (diffractive PDFs) and their uncertainties. This is the first global set of diffractive PDFs determined within the {\tt xFitter} framework. This analysis is motivated by all available and most up-to-date data on inclusive diffractive deep inelastic scattering (diffractive DIS). Heavy quark contributions are considered within the framework of the Thorne-Roberts (TR) general mass variable flavor number scheme (GM-VFNS). We form a mutually consistent set of diffractive PDFs due to the inclusion of high-precision data from H1/ZEUS combined inclusive diffractive cross sections me…

QuarkParticle physicsPhysics and Astronomy (miscellaneous)parton distribution functionsHERAPREDICTIONSFOS: Physical scienceslcsh:AstrophysicsPartonhiukkasfysiikkaPROTON114 Physical sciences01 natural sciencesZeus (malware)CROSS-SECTIONSHigh Energy Physics - ExperimentDEEP-INELASTIC SCATTERINGHigh Energy Physics - Experiment (hep-ex)High Energy Physics - Phenomenology (hep-ph)deep inelastic scatteringlcsh:QB460-4660103 physical sciencesquantum chromodynamicslcsh:Nuclear and particle physics. Atomic energy. RadioactivityQCD ANALYSIS010306 general physicsEngineering (miscellaneous)PhysicsQuantum chromodynamicsLarge Hadron Collider010308 nuclear & particles physicsHERADeep inelastic scatteringHigh Energy Physics - PhenomenologyDistribution functionTESTSPHOTOPRODUCTIONlcsh:QC770-798LHC
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EPPS16 - First nuclear PDFs to include LHC data

2017

We present results of our recent EPPS16 global analysis of NLO nuclear parton distribution functions (nPDFs). For the first time, dijet and heavy gauge boson production data from LHC proton-lead collisions have been included in a global fit. Especially, the CMS dijets play an important role in constraining the nuclear effects in gluon distributions. With the inclusion of also neutrino-nucleus deeply-inelastic scattering and pion-nucleus Drell-Yan data and a proper treatment of isospin-corrected data, we were able to free the flavor dependence of the valence and sea quark nuclear modifications for the first time. This gives us less biased, yet larger, flavor by flavor uncertainty estimates. …

Uncertainty estimates Uncertainty analysisHigh Energy Physics::LatticeLead collisionsNuclear TheoryHigh Energy Physics::PhenomenologyFOS: Physical sciencesNuclear parton distribution functions114 Physical sciencesHigh Energy Physics - ExperimentHigh Energy Physics - PhenomenologyHigh Energy Physics - Experiment (hep-ex)High Energy Physics - Phenomenology (hep-ph)Production dataHigh Energy Physics::ExperimentNuclear modificationNuclear ExperimentNuclear effectsBosonsDistribution functionsGlobal analysisInelastic scattering Deeply inelastic scatterings
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Spatially dependent parton distribution functions and hard processes in nuclear collisions

2014

hadron productionparton distribution functionsHeavy ion phenomenologythermal photonsNuclear PDFsHard processestermiset fotonitnuclear collisionsfragmentation functionsDirect photonsQCD phenomenologypartonijakaumatfragmentaatiofunktiotydintörmäyksetForward rapiditiesteoreettinen fysiikkaProton+nucleus collisionshadronituotto
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