Abstract
Measurements of inclusive and differential top-quark pair production cross sections at a center of mass energy of 8 and 7 TeV are presented. The total cross section is measured in the lepton+jets and the dileptonic decay modes. Differential cross sections are obtained as a function of various kinematic observables, including the transverse momentum and rapidity of the (anti)top quark, kinematics of the top-antitop system, and jet multiplicity in the event. The precise results are used to extract the strong coupling constant from inclusive top-pair production cross sections. All measurements use LHC data collected by the CMS experiment in 2011 and 2012.
Highlights
Differential cross sections are obtained as a function of various kinematic observables, including the transverse momentum and rapidity of thetop quark, kinematics of the top-antitop system, and jet multiplicity in the event
A precise measurement of tt cross sections in proton-proton collisions at the Large Hadron Collider (LHC) offers a benchmark for the production mechanism of processes dominated by gluon-gluon fusion
The inclusive and differential cross section measurements presented in this note use pp collision data collected with the CMS detector [1] in 2011 and 2012 at a center of mass energy of 7 or 8 TeV, respectively
Summary
A precise measurement of tt cross sections in proton-proton (pp) collisions at the Large Hadron Collider (LHC) offers a benchmark for the production mechanism of processes dominated by gluon-gluon fusion. It can be used to validate calculations in quantum chromodynamics or to provide constraints on standard model parameters and parton distribution functions. An accurate understanding of the tt production and decay is crucial for searches for new physics processes that show a similar event topology. The inclusive and differential cross section measurements presented in this note use pp collision data collected with the CMS detector [1] in 2011 and 2012 at a center of mass energy of 7 or 8 TeV, respectively
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