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The inclusive production of four isolated charged leptons in $pp$ collisionsis analysed for the presence of hard double-parton scattering, using 20.2fb$^{-1}$ of data recorded in the ATLAS detector at the LHC at centre-of-massenergy $\sqrt{s}$ = 8 TeV. In the four-lepton invariant-mass range of$80<m_{4\ell}<1000$ GeV, an artificial neural network is used to enhance theseparation between single- and double-parton scattering based on the kinematicsof the four leptons in the final state. An upper limit on the fraction ofevents originating from double-parton scattering is determined at 95%confidence level to be $f_{\mathrm{DPS}} = 0.042$, which results in anestimated lower limit on the effective cross section at 95% confidence level of$1.0$ mb.

physics letters b

Study of the hard double-parton scattering contribution to inclusive  four-lepton production in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the  ATLAS detector