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https://hdl.handle.net/1822/45150
Título: | Study of hard double-parton scattering in four-jet events in pp collisions at √s=7 TeV with the ATLAS experiment |
Autor(es): | Onofre, A. Castro, Nuno Filipe Silva Fernandes ATLAS Collaboration |
Palavras-chave: | Hadron-Hadron scattering (experiments) |
Data: | 2016 |
Editora: | Springer Verlag |
Revista: | Journal of High Energy Physics |
Citação: | Aaboud, M., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., . . . Zwalinski, L. (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). doi: 10.1007/jhep11(2016)110 |
Resumo(s): | 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 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 estimated to be fDPS = 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, σeff , was determined to be σeff = 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 σeff , 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. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/45150 |
DOI: | 10.1007/jhep11(2016)110 |
ISSN: | 1029-8479 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | LIP - Artigos/papers |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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art_3A10.1007_2FJHEP11_282016_29110.pdf | 1,36 MB | Adobe PDF | Ver/Abrir |