Measurements of $t\bar{t}$ 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

Bakhshiansohi, Hamed;Bondu, Olivier;Brochet, Sébastien;Bruno, Giacomo;Wertz, Sébastien;et.al.
(2018) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. B776, p. 355-378 (2018)

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Authors
  • Bakhshiansohi, HamedUCLouvain
    Author
  • Bondu, OlivierUCLouvain
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  • Brochet, SébastienUCLouvain
    Author
  • Author
  • de Visscher, SimonUCLouvain
    Author
  • Author
  • Delcourt, MartinUCLouvain
    Author
  • Author
  • Author
  • Komm, MatthiasUCLouvain
    Author
  • Krintiras, GeorgiosUCLouvain
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  • Author
  • Magitteri, AlessioUCLouvain
    Author
  • Musich, MarcoUCLouvain
    Author
  • Piotrzkowski, KrzysztofUCLouvain
    Author
  • Author
  • Vidal Maroño, MiguelUCLouvain
    Author
  • Wertz, Sébastienorcid-logoUCLouvain
    Author
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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
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Citations

Bakhshiansohi, H., Bondu, O., Brochet, S., Bruno, G., Caudron, A., de Visscher, S., Delaere, C., Delcourt, M., François, B., Giammanco, A., Jafari, A., Komm, M., Krintiras, G., Lemaitre, V., Magitteri, A., Mertens, A., Musich, M., Piotrzkowski, K., Quertenmont, L., et al. (2018). Measurements of $t\bar{t}$ 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. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, B776, 355-378. https://doi.org/10.1016/j.physletb.2017.11.043 (Original work published 2018)