Constraining Gluon Distributions in Nuclei Using Dijets in Proton-Proton and Proton-Lead Collisions at ?s Nn = 5.02 Tev
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Karapınar, Güler
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35
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Abstract
The pseudorapidity distributions of dijets as functions of their average transverse momentum (pTave) 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 pTave 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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Distribution functions, Nuclear reactions, Quantum theory, Lead collisions, Transverse momenta, Center-of-mass energies, Standard Model, 550, Physics - CERN - LHC - CMS, nucl-ex, High Energy Physics - Experiment, Pseudorapidity distributions, DEPENDENCE, RAPIDITY, TRANSVERSE-MOMENTUM; JET PRODUCTION; PB COLLISIONS; PARTICLE-PRODUCTION; DEPENDENCE; PDFS; CENTRALITY; RAPIDITY; SPECTRA, info:eu-repo/classification/ddc/530, High energy physics ; Experimental particle physics ; LHC ; CMS ; Standard Model, Nuclear Experiment, [Anahtar Kelime Yok], Multidisciplinary, 02 Physical Sciences, CMS, PB COLLISIONS, Physics, ddc:530, Nuclear parton distribution functions, 3100 General Physics and Astronomy, Physical sciences, Q1 Science (General) / természettudomány általában, Transverse momenta, Physical Sciences, CMS Collaboration, Physique des particules élémentaires, PARTICLE PHYSICS, Nuclear reactions, LHC, Next-to-leading orders, PDFS, Distribution functions, General Physics, 530 Physics, Physics, Multidisciplinary, 10192 Physics Institute, Fizik, 530, JET PRODUCTION, CENTRALITY, Physics and Astronomy (all), Center-of-mass energies, Perturbative quantum chromodynamics, SPECTRA, PARTICLE-PRODUCTION, High energy physics, Nucleon-nucleon, ЭБ БГУ::ЕСТЕСТВЕННЫЕ И ТОЧНЫЕ НАУКИ::Физика, Science & Technology, PARTICLE PHYSICS;LARGE HADRON COLLIDER;CMS, hep-ex, Lead collisions, TRANSVERSE-MOMENTUM, LARGE HADRON COLLIDER, hadron-hadron scattering (experiments); proton-lead scattering (experiments); cms; lhc; dijets, Quantum theory, Experimental particle physics
Fields of Science
01 natural sciences, 06 humanities and the arts, 0103 physical sciences, 0105 earth and related environmental sciences, 0604 arts
Citation
Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., Brandstetter, J. ...CMS Collaboration (2018). Constraining gluon distributions in nuclei using dijets in proton-proton and proton-lead collisions at √s NN = 5.02 TeV. Physical Review Letters, 121(6). doi:10.1103/PhysRevLett.121.062002
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121
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6
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