he production of W bosons in association with two jets in proton–proton collisions at a centre-of-mass energy of √ s = 7TeV has been analysed for the presence of double-parton interactions using data corresponding to an integrated luminosity of 36pb − 1 , collected with the ATLAS detector at the Large Hadron Collider. The fraction of events arising from double-parton interactions, f ( D ) DP , has been measured through the p T balance between the two jets and amounts to f ( D ) DP = 0 . 08 ± 0 . 01 ( stat .) ± 0 . 02 ( sys .) for jets with transverse momentum p T > 20GeV and rapidity | y | < 2 . 8. This corresponds to a measurement of the effective area parameter for hard double-parton interactions of σ eff = 15 ± 3 ( stat .) +5 − 3 ( sys .) mb.

G Aad, T Abajyan, B Abbott, J Abdallah, S Abdel Khalek, A A Abdelalim, et al. (2013). Measurement of hard double-parton interactions inW(???) + 2-jet events at $\sqrt{s}\,=7$ TeV with the ATLAS detector. NEW JOURNAL OF PHYSICS, 15, 033038-1-033038-39 [10.1088/1367-2630/15/3/033038].

Measurement of hard double-parton interactions inW(???) + 2-jet events at $\sqrt{s}\,=7$ TeV with the ATLAS detector

BELLAGAMBA, LORENZO;BERTIN, ANTONIO;BOSCHERINI, DAVIDE;BRUNI, ALESSIA;BRUNI, GRAZIANO;CAFORIO, DAVIDE;DE CASTRO, STEFANO;DI SIPIO, RICCARDO;FABBRI, LAURA;FRANCHINI, MATTEO;GIACOBBE, BENEDETTO;MASSA, IGNAZIO GIACOMO;MENGARELLI, ALBERTO;MONZANI, SIMONE;