Measurement of the top quark pair production cross section at 13 TeV with the CMS detector

Abstract

Since the discovery of the top quark in 1995 at the Fermilab Tevatron collider, the ttbar production cross section has been measured with ever higher precision. Up to now, no deviation from the standard model has been found. With the restart of the LHC mid of this year, the LHC enables us to measure ttbar production at the previously unreached energy of 13 TeV. In this report, the very first ttbar cross section measurement in the dileptonic channel using the electron-muon final state is described. Systematic uncertainties are discussed and the measurement is compared to theory predictions. Presented at TOP2015 8th International Workshop on Top Quark Physics Measurement of the top quark pair production cross section at 13 TeV with the CMS detector Till Arndt∗† Deutsches Elektronen-Synchrotron Hamburg and Zeuthen (DE) E-mail: till.michael.arndt@cern.ch Since the discovery of the top quark in 1995 at the Fermilab Tevatron collider, the ttbar production cross section has been measured with ever higher precision. By now, no deviation from the standard model has been found. With the restart of the LHC mid of this year, the LHC enables us to measure ttbar production at a previously unreached energy of 13 TeV. In this presentation, the very first ttbar cross section measurement from CMS using the electron-muon final state is discussed. Moreover, detector related efficiencies are outlined and the measurement is compared to theory predictions. 8th International Workshop on Top Quark Physics, TOP2015 14-18 September, 2015 Ischia, Italy ∗Speaker. †A footnote may follow. c © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0). http://pos.sissa.it/ Measurement of the top quark pair production cross section at 13 TeV with the CMS detector Till Arndt