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Measurement of Double-Differential Cross Sections for Top Quark Pair Production in Pp Collisions at √s = 8 TeV and Impact on Parton Distribution Functions

By Daniel Robert Abercrombie, Brandon Leigh Allen, Aram Apyan, Virginia Azzolini, Richard Alexander Barbieri, Austin Alan Baty, Ran Bi, Katharina Bierwagen, Stephanie Akemi Brandt, Wit Busza, Ivan Amos Cali, Mariarosaria D'Alfonso, Zeynep Demiragli, Guillelmo Gomez-Ceballos, Maxim Goncharov, Dylan George Hsu, Yutaro Iiyama, Gian Michele Innocenti, Markus Klute, Dmytro Kovalskyi, Krisztian F. Krajczar, Yue Shi Lai, Yen-Jie Lee, Andrew Michael Levin, P David Luckey Jr, Benedikt Maier, Andrea Carlo Marini, Christopher Francis McGinn, Camelia Maria Mironov, Siddharth Madhavan Narayanan, Xinmei Niu, Christoph M. E. Paus, Christof E Roland, Jakob Maxillian Henry Salfeld-Nebgen, George S. F. Stephans, Kaya Tatar, Dragos Alexandru Velicanu, J. Wang, Ta-Wei Wang and Boleslaw Wyslouch

Abstract

Normalized double-differential cross sections for top quark pair (t[bar over 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[superscript -1]. The measurement is performed in the dilepton e[superscript ±]μ[superscript ∓] final state. The t[bar over t] cross section is determined as a function of various pairs of observables characterizing the kinematics of the top quark and t[bar over 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 tt¯ cross sections in a fit of parametrized parton distribution functions is shown to have significant impact on the gluon distribution.United States. Department of EnergyNational Science Foundation (U.S.

Publisher: 'Springer Science and Business Media LLC'
Year: 2017
DOI identifier: 10.1140/epjc/s10052-017-4984-5
OAI identifier: oai:dspace.mit.edu:1721.1/117466
Provided by: DSpace@MIT
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