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  • Measurement of double-diffe...
    Gul, M.; Tytgat, M.; Francois, B.; Jafari, A.; Padula, Sandra S.; Jiang, C. H.; Spiezia, A.; Popov, A.; Eichhorn, T.; Draeger, A. R.; Gonzalez, D.; Fink, S.; Goldenzweig, P.; Flouris, G.; Foudas, C.; Sikler, F.; Czellar, S.; Molnar, J.; Shukla, P.; Aziz, T.; Guchait, M.; Giacomelli, P.; Ferro, F.; Tosi, S.; Malvezzi, S.; Di Guida, S.; Fienga, F.; Boletti, A.; Checchia, P.; Ventura, S.; Savoy-Navarro, A.; Longo, E.; Marzocchi, B.; Biino, C.; Degano, A.; Monteno, M.; Pastrone, N.; Kim, J.; Yusli, M. N.; Pedraza, I.; Di Francesco, A.; Vadruccio, D.; Bunin, P.; Golutvin, I.; Skatchkov, N.; Vorobyev, A.; Lychkovskaya, N.; Azhgirey, I.; Garcia-Ferrero, J.; Matorras, F.; Rodrigo, T.; Ruiz-Jimeno, A.; Camporesi, T.; David, A.; Gigi, D.; Sauvan, J. B.; Bertl, W.; Casal, B.; Chen, P. H.; Miñano Moya, M.; Boran, F.; Topakli, H.; Ball, F.; Penning, B.; Cooper, S. I.; Piperov, S.; Chertok, M.; Saltzberg, D.; Ellison, J.; Ghiasi Shirazi, S. M. A.; Long, O. R.; Olivito, D.; Wood, J.; Bunn, J.; Newman, H. B.; Johnson, A.; Freeman, J.; Hasegawa, S.; McBride, P.; Strobbe, N.; Martinez, G.; Baarmand, M. M.; Gerber, C. E.; Khalil, S.; Luckey, P. D.; Kao, S. C.; Ruckstuhl, N.; Nguyen, D.; Teixeira De Lima, R.; Reinsvold, A.; Rupprecht, N.; Antonelli, L.; Hill, C.; Driga, O.; Piroué, P.; Li, W.; Betchart, B.; Heideman, J.; Duric, S.; Lanaro, A.

    The European physical journal. C, Particles and fields, 07/2017, Letnik: 77, Številka: 7
    Journal Article

    Normalized double-differential cross sections for top quark pair ( t t ¯ ) production are measured in pp collisions at a centre-of-mass energy of 8 TeV with the CMS experiment at the LHC. The analyzed data correspond to an integrated luminosity of 19.7 fb - 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.