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Constraining gluon distributions in nuclei using dijets in proton-proton and proton-lead collisions at √sNN=5.02  TeV

Constraining gluon distributions in nuclei using dijets in proton-proton and proton-lead collisions at √sNN=5.02  TeV
Constraining gluon distributions in nuclei using dijets in proton-proton and proton-lead collisions at √sNN=5.02  TeV
The pseudorapidity distributions of dijets as functions of their average transverse momentum (paveT) 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 paveT 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.
1079-7114
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

Belyaev, Alexander , The CMS Collaboration (2018) Constraining gluon distributions in nuclei using dijets in proton-proton and proton-lead collisions at √sNN=5.02  TeV. Physical Review Letters, 121 (6). (doi:10.1103/PhysRevLett.121.062002).

Record type: Article

Abstract

The pseudorapidity distributions of dijets as functions of their average transverse momentum (paveT) 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 paveT 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.

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e-pub ahead of print date: 7 August 2018
Published date: 10 August 2018

Identifiers

Local EPrints ID: 424348
URI: https://eprints.soton.ac.uk/id/eprint/424348
ISSN: 1079-7114
PURE UUID: b14d7f79-9835-43be-a27a-7888087838d1
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

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Date deposited: 05 Oct 2018 11:36
Last modified: 15 Mar 2019 01:33

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