Aaboud, M. and Aad, G. and Abbott, B. and Abdallah, J. and Abdinov, O. and Krasznahorkay, Attila and Pásztor, Gabriella and Tóth, József (2016) Study of hard double-parton scattering in four-jet events in pp collisions at √s=7 TeV with the ATLAS experiment. JOURNAL OF HIGH ENERGY PHYSICS, 2016 (11). ISSN 1126-6708
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Abstract
Inclusive four-jet events produced in proton–proton collisions at a centre-of-mass energy of√s = 7 TeV are analysed for the presence of hard double-parton scattering using data corres- ponding 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 |η| ≤ 4.4, and at least one having pT ≥ 42.5 GeV, the contribution of hard double-parton scattering is estim- ated to be fDPS = 0.092 +0.005 −0.011 (stat.) +0.033 −0.037 (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, σeff , was determined to be σeff = 14.9 +1.2 −1.0 (stat.) +5.1 −3.8 (syst.) mb. This result is consistent within the quoted uncertainties with previous measurements of σeff , performed at centre-of-mass energies between 63 GeV and 8 TeV using various final states, and it corresponds to 21+7 −6% of the total inelastic cross-section measured at √s = 7 TeV. The distributions of the observables sensitive to the contribution of hard double-parton scattering, corrected for detector effects, are also provided.
Item Type: | Article |
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Subjects: | Q Science / természettudomány > QC Physics / fizika |
SWORD Depositor: | MTMT SWORD |
Depositing User: | MTMT SWORD |
Date Deposited: | 14 Sep 2023 13:34 |
Last Modified: | 14 Sep 2023 13:35 |
URI: | http://real.mtak.hu/id/eprint/173604 |
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