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Asilar, E.; Waltenberger, W.; Wulz, C.-E.; Mossolov, V.; D’Hondt, J.; Brun, H.; Brito, L.; Pol, M. E.; Guativa, L. M. Huertas; Dimitrov, A.; Spiezia, A.; Qian, S. J.; Rykaczewski, H.; Mahmoud, M. A.; Luukka, P.; Jarry, P.; Antropov, I.; Beauceron, S.; Radziej, M.; Müller, T.; Eichhorn, T.; Lipka, K.; Stefaniuk, N.; Butz, E.; Plagge, M.; Williamson, S.; Wöhrmann, C.; Wolf, R.; Szillasi, Z.; Bartók, M.; Raics, P.; Bansal, S.; Kumar, A.; Chudasama, R.; Rane, A.; My, S.; Battilana, C.; Costa, S.; Tosi, S.; Brianza, L.; Tabarelli de Fatis, T.; Gonella, F.; Mantovani, G.; Santocchia, A.; Martini, L.; Organtini, G.; Obertino, M. M.; Pacher, L.; Lee, S. W.; Lee, A.; Jo, Y.; Seo, S. H.; Heredia-De La Cruz, I.; Sanchez-Hernandez, A.; Górski, M.; Hollar, J.; Vadruccio, D.; Voytishin, N.; Volkov, A.; Cirkovic, P.; Devetak, D.; Moran, D.; Ball, A. H.; Girone, M.; Petrilli, A.; Bertl, W.; Erdmann, W.; Pauss, F.; Yu, S. S.; Srimanobhas, N.; Boran, F.; Kara, O.; Seif El Nasr-storey, S.; Bainbridge, R.; Casasso, S.; Zenz, S. C.; Rankin, D.; Laird, E.; Conway, R.; Hanson, G.; Franco Sevilla, M.; Sexton-Kennedy, E.; Das, S.; Korytov, A.; Sperka, D.; Skuja, A.; Kao, S. C.; Kubota, Y.; Charaf, O.; Lannon, K.; Musienko, Y.; Reinsvold, A.; Wang, F.; Roberts, J.; Saka, H.; Sheldon, P.; Sun, X.; Caillol, C.; Grothe, M.; Hussain, U.
European physical journal. C, Particles and fields, 7/2017, Letnik: 77, Številka: 7Journal Article
Abstract Normalized double-differential cross sections for top quark pair ( $$\mathrm{t}\overline{\mathrm{t}}$$ t t ¯ ) production are measured in pp collisions at a centre-of-mass energy of 8 $$\,\text {TeV}$$ TeV with the CMS experiment at the LHC. The analyzed data correspond to an integrated luminosity of 19.7 $$\,\text {fb}^{-1}$$ fb - 1 . The measurement is performed in the dilepton $$\mathrm {e}^{\pm }\mu ^{\mp }$$ e ± μ ∓ final state. The $$\mathrm{t}\overline{\mathrm{t}}$$ t t ¯ cross section is determined as a function of various pairs of observables characterizing the kinematics of the top quark and $$\mathrm{t}\overline{\mathrm{t}}$$ 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 $$\mathrm{t}\overline{\mathrm{t}}$$ t t ¯ cross sections in a fit of parametrized parton distribution functions is shown to have significant impact on the gluon distribution.
