Search for standard model production of four top quarks with same-sign and multilepton final states in proton–proton collisions at √s=13TeV

  • Sirunyan, AM
  • Tumasyan, A
  • Adam, W
  • Ambrogi, F
  • Asilar, E
  • Bergauer, T
  • Brandstetter, J
  • Brondolin, E
  • Dragicevic, M
  • Erö, J
  • Escalante Del Valle, A
  • Flechl, M
  • Friedl, M
  • Frühwirth, R
  • Ghete, VM
  • Grossmann, J
  • Hrubec, J
  • Jeitler, M
  • König, A
  • Krammer, N
  • Krätschmer, I
  • Liko, D
  • Madlener, T
  • Mikulec, I
  • Pree, E
  • Rad, N
  • Rohringer, H
  • Schieck, J
  • Schöfbeck, R
  • Spanring, M
  • Spitzbart, D
  • Taurok, A
  • Waltenberger, W
  • Wittmann, J
  • Wulz, CE
  • Zarucki, M
  • Chekhovsky, V
  • Mossolov, V
  • Suarez Gonzalez, J
  • De Wolf, EA
  • Di Croce, D
  • Janssen, X
  • Lauwers, J
  • Van De Klundert, M
  • Van Haevermaet, H
  • Van Mechelen, P
  • Van Remortel, N
  • Abu Zeid, S
  • Blekman, F
  • D Hondt, J
  • De Bruyn, I
  • De Clercq, J
  • Deroover, K
  • Flouris, G
  • Lontkovskyi, D
  • Lowette, S
  • Marchesini, I
  • Moortgat, S
  • Moreels, L
  • Python, Q
  • Skovpen, K
  • Tavernier, S
  • Van Doninck, W
  • Van Mulders, P
  • Van Parijs, I
  • Beghin, D
  • Bilin, B
  • Brun, H
  • Clerbaux, B
  • De Lentdecker, G
  • Delannoy, H
  • Dorney, B
  • Fasanella, G
  • Favart, L
  • Goldouzian, R
  • Grebenyuk, A
  • Kalsi, AK
  • Lenzi, T
  • Luetic, J
  • Maerschalk, T
  • Marinov, A
  • Seva, T
  • Starling, E
  • Vander Velde, C
  • Vanlaer, P
  • Vannerom, D
  • Yonamine, R
  • Zenoni, F
  • Cornelis, T
  • Dobur, D
  • Fagot, A
  • Gul, M
  • Khvastunov, I
  • Poyraz, D
  • Roskas, C
  • Salva, S
  • Trocino, D
  • Tytgat, M
  • Verbeke, W
  • Zaganidis, N
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Publication date
February 2018
Publisher
Springer Science and Business Media LLC
Journal
The European Physical Journal C

Abstract

A search for standard model production of four top quarks (t t ¯ t t ¯) is reported using events containing at least three leptons (e , μ) or a same-sign lepton pair. The events are produced in proton–proton collisions at a center-of-mass energy of 13TeV at the LHC, and the data sample, recorded in 2016, corresponds to an integrated luminosity of 35.9fb-1. Jet multiplicity and flavor are used to enhance signal sensitivity, and dedicated control regions are used to constrain the dominant backgrounds. The observed and expected signal significances are, respectively, 1.6 and 1.0 standard deviations, and the t t ¯ t t ¯ cross section is measured to be 16.9-11.4+13.8fb, in agreement with next-to-leading-order standard model predictions. These re...

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