PT Journal
AU ATLAS Collaboration (Aad, Gea
   Aparisi Pozo, JA
   Bailey, AJ
   Cabrera Urban, S
   Cardillo, F
   Castillo, FL
   Castillo Gimenez, V
   Costa, MJ
   Escobar, C
   Estrada Pastor, O
   Ferrer, A
   Fiorini, L
   Fullana Torregrosa, E
   Fuster, J
   Garcia, C
   Garcia Navarro, JE
   Gonzalez de la Hoz, S
   Gonzalvo Rodriguez, GR
   Guerrero Rojas, JGR
   Higon-Rodriguez, E
   Lacasta, C
   Lozano Bahilo, JJ
   Madaffari, D
   Mamuzic, J
   Marti-Garcia, S
   Martinez Agullo, P
   Mitsou, VA
   Moreno Llacer, M
   Poveda, J
   Prades Ibañez, A
   Rodriguez Bosca, S
   Ruiz-Martinez, A
   Salt, J
   Santra, A
   Sayago Galvan, I
   Soldevila, U
   Sanchez, J
   Torro Pastor, E
   Valero, A
   Valls Ferrer, JA
   Vos, M
TI Evidence for ttbar ttbar production in the multilepton final state in proton-proton collisions at root s=13 TeV with the ATLAS detector
SO European Physical Journal C
JI Eur. Phys. J. C
PY 2020
BP 1085
EP 32pp
VL 80
IS 11
DI 10.1140/epjc/s10052-020-08509-3
LA English
AB A search is presented for four-top-quark production using an integrated luminosity of 139 fb-1 of proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the LHC. Events are selected if they contain a same-sign lepton pair or at least three leptons (electrons or muons). Jet multiplicity, jet flavour and event kinematics are used to separate signal from the background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The four-top-quark production cross section is measured to be 24-6+7 fb. This corresponds to an observed (expected) significance with respect to the background-only hypothesis of 4.3 (2.4) standard deviations and provides evidence for this process.
ER