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

Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Asilar, Ece and Md. Ali, Mohd. Adli (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). 062002-1. ISSN 0031-9007 E-ISSN 1079-7114

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Abstract

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

Item Type:	Article (Journal)
Additional Information:	7861/66765
Uncontrolled Keywords:	Gluon; Nuclei using dijets; Proton-proton; Proton-lead collisions
Subjects:	Q Science > Q Science (General) Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Physics
Depositing User:	Dr Mohd Adli MD Ali
Date Deposited:	10 Oct 2018 13:32
Last Modified:	24 Jan 2019 10:23
URI:	http://irep.iium.edu.my/id/eprint/66765

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