Study of the hard double-parton scattering contribution to inclusive four-lepton production in pp collisions at s√ = 8 TeV with the ATLAS detector Aaboud, M. Aguilar Saavedra, Juan Antonio Atlas Collaboration Four-lepton production Double Drell–Yan Double parton-scattering Higgs golden decay channel The inclusive production of four isolated charged leptons in pp collisions is analysed for the presence of hard double-parton scattering, using 20.2 fb−1 of data recorded in the ATLAS detector at the LHC at centre-of-mass energy s√ = 8 TeV. In the four-lepton invariant-mass range of 80<m4ℓ<1000 GeV, an artificial neural network is used to enhance the separation between single- and double-parton scattering based on the kinematics of the four leptons in the final state. An upper limit on the fraction of events originating from double-parton scattering is determined at 95% confidence level to be fDPS=0.042, which results in an estimated lower limit on the effective cross section at 95% confidence level of 1.0 mb. 2020-03-05T09:19:30Z 2020-03-05T09:19:30Z 2019-02-04 info:eu-repo/semantics/article Álvarez Piqueras, D., Aparisi, P., Bailey, A. J., Barranco, L., Cabrera, S., Castillo, F. L., ... & Estrada, O. (2019). Study of the hard double-parton scattering contribution to inclusive four-lepton production in pp collisions at s= 8 TeV with the ATLAS detector. http://hdl.handle.net/10481/60024 10.1016/j.physletb.2019.01.062 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España Elsevier BV