%0 Journal Article
%T Study of hard double-parton scattering in four-jet events in pp collisions root s=7 TeV with the ATLAS experiment
%A ATLAS Collaboration (Aaboud, M. et al
%A Alvarez Piqueras, D.
%A Barranco Navarro, L.
%A Cabrera Urban, S.
%A Castillo Gimenez, V.
%A Cerda Alberich, L.
%A Costa, M. J.
%A Fernandez Martinez, P.
%A Ferrer, A.
%A Fiorini, L.
%A Fuster, J.
%A Garcia, C.
%A Garcia Navarro, J. E.
%A Gonzalez de la Hoz, S.
%A Hernandez Jimenez, Y.
%A Higon-Rodriguez, E.
%A Jimenez Pena, J.
%A King, M.
%A Lacasta, C.
%A Lacuesta, V. R.
%A Mamuzic, J.
%A Marti-Garcia, S.
%A Melini, D.
%A Mitsou, V. A.
%A Pedraza Lopez, S.
%A Rodriguez Rodriguez, D.
%A Romero Adam, E.
%A Ros, E.
%A Salt, J.
%A Sanchez Martinez, V.
%A Soldevila, U.
%A Sanchez, J.
%A Valero, A.
%A Valls Ferrer, J. A.
%A Vos, M.
%J Journal of High Energy Physics
%D 2016
%V 11
%N 11
%I Springer
%@ 1029-8479
%G English
%F ATLASCollaborationAaboud_etal2016
%O WOS:000399296300002
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3083), last updated on Thu, 18 May 2017 08:57:44 +0000
%X Inclusive four-jet events produced in proton-proton collisions at a centre-of mass energy of root s = 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 PT >= 20 GeV and pseudorapidity vertical bar eta vertical bar <= 4.4, and at least one having pT >= 42.5 GeV, the contribution of hard double-parton scattering is estimated to be fDps = 0.092(-0.011)(+0.0005) (stat.) (+0.03337)(-0.011) (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, sigma(eff,) was determined to be sigma(eff) = 14.9(-1.0)(+1.2) (stat.) (+5.1)(-3.8) (syst.) mb. This result is consistent within the quoted uncertainties with previous measurements of sigma(eff), performed at centre-of-mass energies between 63 GeV and 8 TeV using various final states, and it corresponds to 21(-6%)(+7) of the total inelastic cross-section measured at root s = 7 TeV. The distributions of the observables sensitive to the contribution of hard double-parton scattering, corrected for detector effects, are also provided.
%K Hadron-Hadron scattering (experiments)
%R 10.1007/JHEP11(2016)110
%U http://arxiv.org/abs/1608.01857
%U https://doi.org/10.1007/JHEP11(2016)110
%P 110-52pp