Measurement of the differential cross section for top quark pair production in pp collisions at $\sqrt{s} = 8\,\text {TeV} $

• Main Author: CMS collaboration (2139 authors)
• Publication Date: 2015
• Other Authors: Hollar, Jonathan, Nayak, Aruna, Bargassa, Pedrame, Beirão Da Cruz E Silva, Cristóvão, Faccioli, Pietro, Ferreira Parracho, Pedro Guilherme, Gallinaro, Michele, Lloret Iglesias, Lara, Nguyen, Federico, Rodrigues Antunes, Joao, Seixas, Joao, Varela, Joao, Vischia, Pietro, David Tinoco Mendes, Andre, Musella, Pasquale, Silva, Pedro, Pela, Joao, Leonardo, Nuno
• Format: Article
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: http://dx.doi.org/10.1140/epjc/s10052-015-3709-x; http://hdl.handle.net/10400.26/26839

The normalized differential cross section for top quark pair ( ${\mathrm{t}}\overline{{\mathrm{t}}}$ ) production is measured in pp collisions at a centre-of-mass energy of 8 $\,\text {TeV}$ at the CERN LHC using the CMS detector in data corresponding to an integrated luminosity of 19.7 $\,\text {fb}^{-1}$ . The measurements are performed in the lepton $+$ jets ( $\mathrm {e}/\mu $ $+$ jets) and in the dilepton ( $\mathrm {e}^+\mathrm {e}^-$ , $\mu ^+ \mu ^- $ , and $\mathrm {e}^\pm \mu ^{\mp }$ ) decay channels. The ${\mathrm{t}}\overline{{\mathrm{t}}}$ cross section is measured as a function of the kinematic properties of the charged leptons, the jets associated to b quarks, the top quarks, and the ${\mathrm{t}}\overline{{\mathrm{t}}}$ system. The data are compared with several predictions from perturbative quantum chromodynamic up to approximate next-to-next-to-leading-order precision. No significant deviations are observed relative to the standard model predictions.