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" Measurement of double-differential cross sections for top quark pair production in pp collisions at [Formula: "
Sirunyan, AMTumasyan, AAdam, WAsilar, EBergauer, TBrandstetter, JBrondolin, EDragicevic, MErö, JFlechl, MFriedl, MFrühwirth, RGhete, VMHartl, CHörmann, NHrubec, JJeitler, MKönig, AKrätschmer, ILiko, DMatsushita, TMikulec, IRabady, DRad, NRahbaran, BRohringer, HSchieck, Jet al.
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AL
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| Record Number
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901892
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LA7m60650b
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| Title & Author
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Measurement of double-differential cross sections for top quark pair production in pp collisions at [Formula: [Article]. see text][Formula: see text] and impact on parton distribution functions.\ Sirunyan, AMTumasyan, AAdam, WAsilar, EBergauer, TBrandstetter, JBrondolin, EDragicevic, MErö, JFlechl, MFriedl, MFrühwirth, RGhete, VMHartl, CHörmann, NHrubec, JJeitler, MKönig, AKrätschmer, ILiko, DMatsushita, TMikulec, IRabady, DRad, NRahbaran, BRohringer, HSchieck, Jet al.
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2017
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| Title of Periodical
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UCLA
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| Abstract
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Normalized double-differential cross sections for top quark pair ([Formula: see text]) production are measured in pp collisions at a centre-of-mass energy of 8[Formula: see text] with the CMS experiment at the LHC. The analyzed data correspond to an integrated luminosity of 19.7[Formula: see text]. The measurement is performed in the dilepton [Formula: see text] final state. The [Formula: see text] cross section is determined as a function of various pairs of observables characterizing the kinematics of the top quark and [Formula: see text] 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 [Formula: see text] cross sections in a fit of parametrized parton distribution functions is shown to have significant impact on the gluon distribution.
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