Constraining Gluon Distributions in Nuclei Using Dijets in Proton-Proton and Proton-Lead Collisions at sqrt[s_{NN}]=5.02  TeV

Physical Review Letters
A M SirunyanCMS Collaboration

Abstract

The pseudorapidity distributions of dijets as functions of their average transverse momentum (p_{T}^{ave}) are measured in proton-lead (pPb) and proton-proton (pp) collisions. The data samples were collected by the CMS experiment at the CERN LHC, at a nucleon-nucleon center-of-mass energy of 5.02 TeV. A significant modification of the pPb spectra with respect to the pp spectra is observed in all p_{T}^{ave} intervals investigated. The ratios of the pPb and pp distributions are compared to next-to-leading order perturbative quantum chromodynamics calculations with unbound nucleon and nuclear parton distribution functions (PDFs). These results give the first evidence that the gluon PDF at large Bjorken x in lead ions is strongly suppressed with respect to the PDF in unbound nucleons.

References

Jun 13, 2015·The European Physical Journal. C, Particles and Fields·V KhachatryanUNKNOWN CMS Collaboration
Jun 30, 2015·The European Physical Journal. C, Particles and Fields·L A Harland-LangR S Thorne
Feb 6, 2016·Physical Review Letters·V KhachatryanUNKNOWN CMS Collaboration
Jan 1, 2016·The European Physical Journal. C, Particles and Fields·Néstor ArmestoPía Zurita
Jan 1, 2016·The European Physical Journal. C, Particles and Fields·V KhachatryanAuthorinst The Cms Collaboration
Apr 15, 2017·The European Physical Journal. C, Particles and Fields·Kari J EskolaCarlos A Salgado

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Citations

May 29, 2021·Physical Review Letters·Alexander HussUrs Achim Wiedemann

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