Measurement of the differential cross section for top quark pair production in pp collisions at √s=8 TeV

Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Filipovic, Nicolas and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Karancsi, János and Molnár, József and Pálinkás, József and Makovec, Alajos and Ujvári, Balázs and Veres, Gábor (2015) Measurement of the differential cross section for top quark pair production in pp collisions at √s=8 TeV. EUROPEAN PHYSICAL JOURNAL C, 75 (11). ISSN 1434-6044

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Abstract

The normalized differential cross section for top quark pair (tt) production is mea- sured in pp collisions at a centre-of-mass energy of 8 TeV at the CERN LHC using the CMS detector in data corresponding to an integrated luminosity of 19.7 fb−1. The measurements are performed in the lepton+jets (e/μ+jets) and in the dilepton (e+e−, μ+μ−, and e±μ∓) decay channels. The tt 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 tt system. The data are compared with several predictions from perturbative QCD up to approximate next-to-next-to-leading-order precision. No sig- nificant deviations are observed relative to the standard model predictions.

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