AI Article Synopsis
- The study measures normalized double-differential cross sections for top quark pair production in proton-proton collisions at 8 TeV using data from the CMS experiment at the LHC, covering an integrated luminosity of 19.7 fb⁻¹.
- The analysis focuses on the dilepton final state, examining how the production cross section varies with different kinematic variables of the top quark and associated systems.
- The findings align with theoretical predictions from quantum chromodynamics and Monte Carlo simulations, especially when incorporating the latest parton distribution functions, indicating a notable influence on the gluon distribution.
Article Abstract
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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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5587255 | PMC |
| http://dx.doi.org/10.1140/epjc/s10052-017-4984-5 | DOI Listing |
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