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Measurement of the top quark pair production cross section in proton-proton collisions at sqrt(s) = 13 TeV

CMS Collaboration

TL;DR

This paper reports the first measurement of the top quark pair production cross section in proton–proton collisions at $\sqrt{s}=13\,\text{TeV}$ with the CMS detector, using an integrated luminosity of 43 $\text{pb}^{-1}$. The analysis selects events with an opposite-charge electron–muon pair and at least two jets, and it extracts the inclusive cross section from event yields after data‑driven background estimation and detector corrections. The measured cross section is $σ_{t\overline{t}} = 746 \pm 58\,\text{(stat)} \pm 53\,\text{(syst)} \pm 36\,\text{(lumi)}\,\text{pb}$, consistent with the SM NNLO+NNLL prediction of $832^{+40}_{-46}\,\text{pb}$ for $m_t=172.5\,\text{GeV}$. The result validates QCD predictions at 13 TeV and informs backgrounds for new physics searches.

Abstract

The top quark pair production cross section is measured for the first time in proton-proton collisions at sqrt(s) = 13 TeV by the CMS experiment at the CERN LHC, using data corresponding to an integrated luminosity of 43 inverse picobarns. The measurement is performed by analyzing events with at least one electron and one muon of opposite charge, and at least two jets. The measured cross section is 746 +/- 58 (stat) +/- 53 (syst) +/- 36 (lumi) pb, in agreement with the expectation from the standard model.

Measurement of the top quark pair production cross section in proton-proton collisions at sqrt(s) = 13 TeV

TL;DR

This paper reports the first measurement of the top quark pair production cross section in proton–proton collisions at with the CMS detector, using an integrated luminosity of 43 . The analysis selects events with an opposite-charge electron–muon pair and at least two jets, and it extracts the inclusive cross section from event yields after data‑driven background estimation and detector corrections. The measured cross section is , consistent with the SM NNLO+NNLL prediction of for . The result validates QCD predictions at 13 TeV and informs backgrounds for new physics searches.

Abstract

The top quark pair production cross section is measured for the first time in proton-proton collisions at sqrt(s) = 13 TeV by the CMS experiment at the CERN LHC, using data corresponding to an integrated luminosity of 43 inverse picobarns. The measurement is performed by analyzing events with at least one electron and one muon of opposite charge, and at least two jets. The measured cross section is 746 +/- 58 (stat) +/- 53 (syst) +/- 36 (lumi) pb, in agreement with the expectation from the standard model.

Paper Structure

This paper contains 1 section, 2 figures, 2 tables.

Table of Contents

  1. The CMS Collaboration

Figures (2)

  • Figure 1: The distributions in (top) the jet multiplicity, and (bottom) $H_\mathrm{T}$ in events passing the dilepton criteria. The expected distributions for ${t}\overline{{t}}$ signal and individual backgrounds are shown after implementing data-based corrections; the last bin contains the overflow in events. The ratios of data to the sum of the expected yields are given at the bottom of each panel.
  • Figure 2: The distributions in (top) the dilepton invariant mass, and (bottom) the difference in the azimuthal angle between the two leptons after all selections. The last bin in (top) contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel.