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Please use this identifier to cite or link to this item: https://elib.bsu.by/handle/123456789/259029
Title: Measurement of double-differential cross sections for top quark pair production in pp collisions at √s=8TeV and impact on parton distribution functions
Authors: Dvornikov, O.
Makarenko, V.
Mossolov, V.
Gonzalez, Suarez J.
Zykunov, V.
Shumeiko, N.
CMS Collaboration
Keywords: ЭБ БГУ::ЕСТЕСТВЕННЫЕ И ТОЧНЫЕ НАУКИ::Физика
Issue Date: 2017
Publisher: Springer
Abstract: Normalized double-differential cross sections for top quark pair (t t ¯) production are measured in pp collisions at a centre-of-mass energy of 8TeV with the CMS experiment at the LHC. The analyzed data correspond to an integrated luminosity of 19.7fb-1. The measurement is performed in the dilepton e ±μ∓ final state. The t t ¯ cross section is determined as a function of various pairs of observables characterizing the kinematics of the top quark and t t ¯ system. The data are compared to calculations using perturbative quantum chromodynamics at next-to-leading and approximate next-to-next-to-leading orders. They are also compared to predictions of Monte Carlo event generators that complement fixed-order computations with parton showers, hadronization, and multiple-parton interactions. Overall agreement is observed with the predictions, which is improved when the latest global sets of proton parton distribution functions are used. The inclusion of the measured t t ¯ cross sections in a fit of parametrized parton distribution functions is shown to have significant impact on the gluon distribution.
URI: https://elib.bsu.by/handle/123456789/259029
DOI: 10.1140/epjc/s10052-017-4984-5
Scopus: 85024387884
Sponsorship: National Science Foundation (NSF) 1151640,1211067,1506130,1506168,1606321,1607202,1624356; Science and Technology Facilities Council (STFC) PP/E000479/1,ST/H000925/1
Appears in Collections:Статьи НИУ «Институт ядерных проблем»

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