Measurement of the differential cross section for top-quark-pair production in the dilepton channel at $\sqrt{s}$ = 13 TeV with the CMS detector

TL;DR

This paper reports measurements of the differential top-quark-pair production cross sections in dilepton final states at 13 TeV, comparing results with QCD predictions to test the Standard Model at the LHC.

Contribution

First measurement of normalized differential $t\bar{t}$ cross sections in dilepton channels at 13 TeV with detailed comparison to QCD calculations.

Findings

QCD calculations broadly agree with measured data

Differential cross sections as functions of top-quark kinematics and jet multiplicity

Results improve understanding of top-quark production at high energies

Abstract

Measurements of normalized differential top-quark-pair ($t\bar{t}$) production cross sections are performed using final states with two leptons ($e^+e^-$, $\mu^+\mu^-$, and $e^\pm\mu^\mp$) in proton-proton ($pp$) collisions at $\sqrt{s}$ = 13 TeV at the CERN LHC. The data were recorded in 2015 with the CMS detector and correspond to an integrated luminosity of 2.2 fb$^{-1}$. The $t\bar{t}$ production cross section is measured as a function of kinematic properties of the top quarks and the $t\bar{t}$ system in the full phase space, as well as of the jet multiplicity in the event in the fiducial phase space. Several perturbative quantum chromodynamics (QCD) calculations are confronted with the data and are found to be broadly in agreement with the measured results.