Bibcode
Sirunyan, A. M.; 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, V. M.; 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, C.-E.; Zarucki, M.; Chekhovsky, V.; Mossolov, V.; Suarez Gonzalez, J.; De Wolf, E. A.; 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, A. K.; 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. et al.
Bibliographical reference
The European Physical Journal C, Volume 78, Issue 2, article id.140, 24 pp.
Advertised on:
2
2018
Citations
20
Refereed citations
17
Description
A search for standard model production of four top quarks (t\overline{t}
t\overline{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 13 {TeV} at the
LHC, and the data sample, recorded in 2016, corresponds to an integrated
luminosity of 35.9 {fb}^{-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\overline{t} t\overline{t} cross section is measured to be
16.9^{+13.8}_{-11.4} {fb}, in agreement with next-to-leading-order
standard model predictions. These results are also used to constrain the
Yukawa coupling between the top quark and the Higgs boson to be less
than 2.1 times its expected standard model value at 95% confidence
level.