# Measurements of tt-bar cross sections in association with b jets and inclusive jets and their ratio using dilepton final states in pp collisions at sqrt(s) = 13 TeV

## TL;DR

This paper reports precise measurements of top-antitop quark pair production with additional b jets and inclusive jets at 13 TeV, providing key data to test Standard Model predictions and improve understanding of top quark processes.

## Contribution

First measurement of the ratio of tt-bar bb-bar to tt-bar jj cross sections in dilepton final states at 13 TeV with detailed systematic analysis.

## Key findings

- Measured ratio sigma[tt-bar bb-bar]/sigma[tt-bar jj] = 0.022 +/- 0.003 (stat) +/- 0.006 (syst)
- Measured sigma[tt-bar bb-bar] = 4.0 +/- 0.6 (stat) +/- 1.3 (syst) pb
- Measured sigma[tt-bar jj] = 184 +/- 6 (stat) +/- 33 (syst) pb

## Abstract

The cross sections for the production of tt-bar bb-bar and tt-bar jj events and their ratio sigma[tt-bar bb-bar]/sigma[tt-bar jj] are measured using data corresponding to an integrated luminosity of 2.3 inverse femtobarns collected in pp collisions at sqrt(s) = 13 TeV with the CMS detector at the LHC. Events with two leptons (e or mu) and at least four reconstructed jets, including at least two identified as b quark jets, in the final state are selected. In the full phase space, the measured ratio is 0.022 +/- 0.003 (stat) +/- 0.006 (syst), the cross section sigma[tt-bar bb-bar] is 4.0 +/- 0.6 (stat) +/- 1.3 (syst) pb and sigma[tt-bar jj] is 184 +/- 6 (stat) +/- 33 (syst) pb. The measurements are compared with the standard model expectations obtained from a POWHEG simulation at next-to-leading-order interfaced with PYTHIA.