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

Agni Bethani, Brian Cox, Jonathan Crane, Cinzia Da Via, Nicholas Dann, Alessandra Forti, David Lack, Frederick Loebinger, Jiri Masik, Stephen Menary, Francisca Munoz Sanchez, Alexander Oh, Emily Orgill, Joleen Pater, Yvonne Peters, Andrew Pilkington, Darren Price, Yang Qin, Jacob Rawling, Nicolas ScharmbergSavanna Shaw, Stephen Watts, Terence Wyatt, The ATLAS Collaboration

    Research output: Contribution to journalArticlepeer-review

    Abstract

    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<m 4ℓ <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 f DPS =0.042, which results in an estimated lower limit on the effective cross section at 95% confidence level of 1.0 mb.

    Original languageEnglish
    Pages (from-to)595-614
    Number of pages20
    JournalPhysics Letters B
    Volume790
    Early online date4 Feb 2019
    DOIs
    Publication statusPublished - 10 Mar 2019

    Keywords

    • Double Drell–Yan
    • Double parton-scattering
    • Four-lepton production
    • Higgs golden decay channel

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