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  • Observation of the associat...
    Abbott, B.; Abbott, D. C.; Agaras, M. N.; Aielli, G.; Anulli, F.; Aoki, M.; Araujo Pereira, R.; Barisits, M-S.; Barnea, R.; Bawa, H. S.; Bingul, A.; Bruschi, M.; Camplani, A.; Cavasinni, V.; Chen, H.; Conventi, F.; Cooper-Sarkar, A. M.; De Santis, M.; Delitzsch, C. M.; DeMarco, D. A.; Deviveiros, P. O.; Di Micco, B.; Dingfelder, J.; D’Onofrio, M.; Doria, A.; Dülsen, C.; Elmsheuser, J.; Fabiani, V.; Fox, H.; Freundlich, E. M.; Gavrilenko, I. L.; Gee, C. N. P.; Ghasemi, S.; Ghosh, A.; Grummer, A.; Guerguichon, A.; Haas, A.; Han, Y. F.; Hays, C. P.; Heinemann, B.; Helling, C. M.; Herten, G.; Hryn’ova, T.; Hubaut, F.; Huhtinen, M.; Izen, J. M.; Jeanneau, F.; Koffas, T.; Korn, A.; Krauss, D.; Kroll, J.; Kuehn, S.; Kukhtin, V.; Liu, Y. L.; Lopez Paz, I.; Lyubushkina, T.; Mann, A.; Marcoccia, L.; Munoz Martinez, J. L.; Murrone, A.; Nagai, K.; Oh, S. H.; Oide, H.; Okumura, Y.; Oppen, H.; Paredes Saenz, S. R.; Pataraia, S.; Perego, M. M.; Peters, K.; Pezzotti, L.; Poggioli, L.; Pohl, D.; Renardi, A.; Richter, R.; Rottler, B.; Sakamoto, H.; Sankey, D. P. C.; Sannino, M.; Semprini-Cesari, N.; Shatalov, P. B.; Shmeleva, A.; Slovak, R.; Sperlich, D.; Steinhebel, A. L.; Sutton, M. R.; Taylor, A. J.; Tipton, P.; Tornambe, P.; Toth, J.; Troncon, C.; Tsukerman, I. I.; Tudorache, V.; Ungaro, F. C.; Vaidya, A.; Vallier, A.; Veen, M. J.; Watts, G.; Xu, Z.; Zambito, S.; Zaripovas, D. R.

    The journal of high energy physics, 07/2020, Letnik: 2020, Številka: 7
    Journal Article

    A bstract Single top-quark production in association with a Z boson, where the Z boson decays to a pair of charged leptons, is measured in the trilepton channel. The proton-proton collision data collected by the ATLAS experiment from 2015 to 2018 at a centre-of-mass energy of 13 TeV are used, corresponding to an integrated luminosity of 139 fb − 1 . Events containing three isolated charged leptons (electrons or muons) and two or three jets, one of which is identified as containing a b -hadron, are selected. The main backgrounds are from t t ¯ Z and diboson production. Neural networks are used to improve the background rejection and extract the signal. The measured cross-section for t ℓ + ℓ − q production, including non-resonant dilepton pairs with m ℓ + ℓ − > 30 GeV, is 97 ± 13 (stat.) ± 7 (syst.) fb, consistent with the Standard Model prediction.