6533b871fe1ef96bd12d1171
RESEARCH PRODUCT
Impact of CMS dijets in 5.02 TeV pPb and pp collisions on EPPS16 nuclear PDFs
Petja PaakkinenKari J. EskolaHannu Paukkunensubject
Hessian matrixPhysicsParticle physicsScale (ratio)Physics::Instrumentation and DetectorsHigh Energy Physics::PhenomenologyNuclear TheoryFOS: Physical scienceshiukkasfysiikka114 Physical sciencesGluonHigh Energy Physics - Phenomenologysymbols.namesakeHigh Energy Physics - Phenomenology (hep-ph)13. Climate actionPseudorapiditysymbolsHigh Energy Physics::ExperimentydinfysiikkaNuclear Experimentdescription
The CMS measurement of dijet pseudorapidity distributions in pPb versus pp collisions at 5.02 TeV provides a direct probe on nuclear gluon PDFs. We show that while the predicted pPb pseudorapidity distributions suffer from sizable free-proton PDF uncertainties, the ratios of the pPb and pp distributions are practically insensitive to scale and free-proton PDF choices. We find the CMS data on pPb to pp ratios to be in good agreement with the EPPS16 nuclear modifications. Using a non-quadratic extension of the Hessian PDF reweighting method, we study the impact of these data on the EPPS16 nuclear PDFs. Relative to EPPS16, we find stronger evidence for mid-x gluon antishadowing as well as indication for larger gluon shadowing at small x. The data are also able to further constrain the gluon PDF in the EMC region.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-12-13 |