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Study of hard double-parton scattering in four-jet events in pp collisions at $ \sqrt{s}=7 $ TeV with the ATLAS experiment

2016-11-21Journal article Open access
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dc.contributor.authorATLAS collaboration (2856 authors)
dc.contributor.authorAguilar-Saavedra, Juan Antonio
dc.contributor.authorAmor Dos Santos, Susana Patricia
dc.contributor.authorAnjos, Nuno
dc.contributor.authorAraque, Juan Pedro
dc.contributor.authorCarvalho, João
dc.contributor.authorCastro, Nuno Filipe
dc.contributor.authorConde Muiño, Patricia
dc.contributor.authorDa Cunha Sargedas De Sousa, Mario Jose
dc.contributor.authorFiolhais, Miguel
dc.contributor.authorGalhardo, Bruno
dc.contributor.authorGomes, Agostinho
dc.contributor.authorGonçalo, Ricardo
dc.contributor.authorJorge, Pedro
dc.contributor.authorMachado Miguens, Joana
dc.contributor.authorMaio, Amélia
dc.contributor.authorManeira, José
dc.contributor.authorOleiro Seabra, Luis Filipe
dc.contributor.authorOnofre, António
dc.contributor.authorPedro, Rute
dc.contributor.authorSantos, Helena
dc.contributor.authorSaraiva, João
dc.contributor.authorSilva, José
dc.contributor.authorTavares Delgado, Ademar
dc.contributor.authorVeloso, Filipe
dc.contributor.authorWolters, Helmut
dc.date.accessioned2019-02-04T10:55:54Z
dc.date.available2019-02-04T10:55:54Z
dc.date.issued2016-11-21
dc.date.updated2019-02-04T10:55:54Z
dc.description.abstractInclusive four-jet events produced in proton-proton collisions at a centre-of-mass energy of $ \sqrt{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 p$_{T}$ ≥ 20 GeV and pseudorapidity |η| ≤ 4.4, and at least one having p$_{T}$ ≥ 42.5 GeV, the contribution of hard double-parton scattering is estimated to be f$_{DPS}$ = 0.092$_{− 0.011}^{+ 0.005}$ (stat.)$_{− 0.037}^{+ 0.033}$ (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, σ$_{eff}$ , was determined to be σ$_{eff}$ = 14. 9$_{− 1.0}^{+ 1.2}$ (stat.)$_{− 3.8}^{+ 5.1}$ (syst.) mb. This result is consistent within the quoted uncertainties with previous measurements of σ$_{eff}$ , 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 $ \sqrt{s}=7 $ TeV. The distributions of the observables sensitive to the contribution of hard double-parton scattering, corrected for detector effects, are also provided.
dc.description.versionPeer Reviewed
dc.identifierJHEP 1611 (2016) 110; DOI 10.1007/JHEP11(2016)110
dc.identifier.urihttp://dx.doi.org/10.1007/JHEP11(2016)110
dc.identifier.urihttp://hdl.handle.net/10400.26/27159
dc.language.isoeng
dc.titleStudy of hard double-parton scattering in four-jet events in pp collisions at $ \sqrt{s}=7 $ TeV with the ATLAS experiment
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

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