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Study of hard double-parton scattering in four-jet events in pp collisions at s = 7 backslashsqrts=7 TeV with the ATLAS experiment

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The ATLAS Collaboration, M. Aaboud, G. Aad, et al

Original languageEnglish
Article number110
Number of pages1
JournalJournal of High Energy Physics
Volume2016
Issue number11
DOIs
Publication statusPublished - 21 Nov 2016

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Abstract

Inclusive four-jet events produced in proton-proton collisions at a centre-of-mass energy of s = 7 backslashsqrts=7 TeV are analysed for the presence of hard double-parton scattering using data corresponding to an integrated luminosity of 37.3 pb−1, collected with the ATLAS detector at the LHC. The contribution of hard double-parton scattering to the production of four-jet events is extracted using an artificial neural network, assuming that hard double-parton scattering can be approximated by an uncorrelated overlaying of dijet events. For events containing at least four jets with transverse momentum p T ≥ 20 GeV and pseudorapidity |$| ≤ 4.4, and at least one having p T ≥ 42.5 GeV, the contribution of hard double-parton scattering is estimated to be f DPSthinspace=thinspace0.092 −thinspace0.011 +thinspace0.005 (stat.) −thinspace0.037 +thinspace0.033 (syst.). After combining this measurement with those of the inclusive dijet and four-jet cross-sections in the appropriate phase space regions, the effective cross-section, $ eff , was determined to be $ effthinspace=thinspace14.thinspace9 −thinspace1.0 +thinspace1.2 (stat.) −thinspace3.8 +thinspace5.1 (syst.) mb. This result is consistent within the quoted uncertainties with previous measurements of $ eff , performed at centre-of-mass energies between 63 GeV and 8 TeV using various final states, and it corresponds to 21 −thinspace6 +thinspace7 thinspace% of the total inelastic cross-section measured at s = 7 backslashsqrts=7 TeV. The distributions of the observables sensitive to the contribution of hard double-parton scattering, corrected for detector effects, are also provided.

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