Measurements of the tt production cross section in lepton+jets final states in pp collisions at 8 TeV and ratio of 8 to 7 TeV cross sections
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Khachatryan2017_Article_MeasurementsOfTheMathrmTOverli.pdf
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1.81 MB
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Author(s)
The CMS Collaboration
Apyan, Aram
Barbieri, Richard Alexander
Baty, Austin Alan
Bierwagen, Katharina
Brandt, Stephanie Akemi
Busza, Wit
Cali, Ivan Amos
Demiragli, Zeynep
Di Matteo, Leonardo
Date Issued
2017
Journal
The European Physical Journal C
Publisher
Springer Nature
Citation
Khachatryan, V., A. M. Sirunyan, A. Tumasyan, W. Adam, E. Asilar, T. Bergauer, et al. “Measurements of the
$$\mathrm{t}\overline{\mathrm{t}}$$
t
t
¯
Production Cross Section in Lepton+jets Final States in Pp Collisions at 8
$$\,\text {TeV}$$
TeV
and Ratio of 8 to 7
$$\,\text {TeV}$$
TeV
Cross Sections.” The European Physical Journal C 77, no. 1 (January 2017). doi:10.1140/epjc/s10052-016-4504-z.
Version
Final published version
Abstract
© 2017, CERN for the benefit of the CMS collaboration. A measurement of the top quark pair production (tt¯) cross section in proton–proton collisions at the centre-of-mass energy of 8TeV is presented using data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.6fb-1. This analysis is performed in the tt¯ decay channels with one isolated, high transverse momentum electron or muon and at least four jets, at least one of which is required to be identified as originating from hadronization of a b quark. The calibration of the jet energy scale and the efficiency of b jet identification are determined from data. The measured tt¯ cross section is 228.5±3.8(stat)±13.7(syst)±6.0(lumi) pb. This measurement is compared with an analysis of 7TeV data, corresponding to an integrated luminosity of 5.0fb-1, to determine the ratio of 8TeV to 7TeV cross sections, which is found to be 1.43±0.04(stat)±0.07(syst)±0.05(lumi). The measurements are in agreement with QCD predictions up to next-to-next-to-leading order.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1140/EPJC/S10052-016-4504-Z
