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Type: Journal article
Title: Study of hard double-parton scattering in four-jet events in pp collisions at √s=7 TeV with the ATLAS experiment
Other Titles: Study of hard double-parton scattering in four-jet events in pp collisions at root s=7 TeV with the ATLAS experiment
Author: Aaboud, M.
Aad, G.
Abbott, B.
Abdallah, J.
Abdinov, O.
Abeloos, B.
Aben, R.
AbouZeid, O.
Abraham, N.
Abramowicz, H.
Abreu, H.
Abreu, R.
Abulaiti, Y.
Acharya, B.
Adachi, S.
Adamczyk, L.
Adams, D.
Adelman, J.
Adomeit, S.
Adye, T.
et al.
Citation: Journal of High Energy Physics, 2016; 2016(11):110-0-110-51
Publisher: Springer-Verlag
Issue Date: 2016
ISSN: 1126-6708
Statement of
The ATLAS collaboration, M. Aaboud ... P. Jackson ... L. Lee ... A. Petridis ... M.J. White ... et al.
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 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 s√=7 TeV. The distributions of the observables sensitive to the contribution of hard double-parton scattering, corrected for detector effects, are also provided.
Keywords: Hadron-Hadron scattering (experiments)
Description: Published: November 21, 2016
Rights: Copyright: © The Author(s) 2016. Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
RMID: 0030059321
DOI: 10.1007/JHEP11(2016)110
Appears in Collections:Physics publications

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