Abstract
Normalized differential cross sections for top quark pair production are measured in the dilepton (e+e−, μ+μ−, and μ∓e±) decay channels in proton-proton collisions at a center-of-mass energy of 13 TeV. The measurements are performed with data corresponding to an integrated luminosity of 2.1 fb−1 using the CMS detector at the LHC. The cross sections are measured differentially as a function of the kinematic properties of the leptons, jets from bottom quark hadronization, top quarks, and top quark pairs at the particle and parton levels. The results are compared to several Monte Carlo generators that implement calculations up to next-to-leading order in perturbative quantum chromodynamics interfaced with parton showering, and also to fixed-order theoretical calculations of top quark pair production up to next-to-next-to-leading order.
Highlights
The tt differential cross section measurements are performed at the particle and parton levels
The measured data are compared to different standard model predictions from powheg+pythia8, MG5 amc@nlo+pythia8[FXFX], MG5 amc@nlo+pythia8[MLM], and powheg+herwig++ in the figures
The differential cross sections are measured as a function of several kinematic variables at particle level in a visible phase space corresponding to the detector acceptance and at parton level in the full phase space
Summary
The central feature of the CMS apparatus is a superconducting solenoid of 6 m internal diameter, providing a magnetic field of 3.8 T. The solenoid volume encases the silicon pixel and strip tracker, a lead tungstate crystal electromagnetic calorimeter, and a brass and scintillator hadron calorimeter, each composed of a barrel and two endcap sections. Forward calorimeters extend the pseudorapidity (η) coverage provided by the barrel and endcap detectors. A more detailed description of the CMS detector, together with a definition of the coordinate system used and the relevant kinematic variables, can be found in ref. The particle-flow (PF) algorithm [18] is used to reconstruct objects in the event, combining information from all the CMS subdetectors.
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