Normalized double-differential cross sections for top quark pair (tt¯) 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 tt¯ cross section is determined as a function of various pairs of observables characterizing the kinematics of the top quark and tt¯ 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 tt¯ cross sections in a fit of parametrized parton distribution functions is shown to have significant impact on the gluon distribution.

(2017). Measurement of double-differential cross sections for top quark pair production in pp collisions at s√=8 TeV and impact on parton distribution functions [journal article - articolo]. In THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. Retrieved from http://hdl.handle.net/10446/143366

Measurement of double-differential cross sections for top quark pair production in pp collisions at s√=8 TeV and impact on parton distribution functions

Re, V.;Vai, I.;
2017-01-01

Abstract

Normalized double-differential cross sections for top quark pair (tt¯) 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 tt¯ cross section is determined as a function of various pairs of observables characterizing the kinematics of the top quark and tt¯ 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 tt¯ cross sections in a fit of parametrized parton distribution functions is shown to have significant impact on the gluon distribution.
articolo
2017
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; F...espandi
(2017). Measurement of double-differential cross sections for top quark pair production in pp collisions at s√=8 TeV and impact on parton distribution functions [journal article - articolo]. In THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. Retrieved from http://hdl.handle.net/10446/143366
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