Measurement of hard double-parton interactions in W(-> lv) plus 2-jet events at root s=7 TeV with the ATLAS detector - eScholarship

Measurement of hard double-parton interactions in W(→ ν) + 2-jet events at s = 7 TeV with the ATLAS detector The ATLAS Collaboration New Journal of Physics 15 (2013) 033038 (39pp) Received 29 January 2013 Published 25 March 2013 Online at http://www.njp.org/ doi:10.1088/1367-2630/15/3/033038 E-mail: atlas.publications@cern.ch The production of W bosons in association √ with two jets in proton–proton collisions at a centre-of-mass energy of s = 7 TeV has been analysed for the presence of double-parton interactions using data corresponding to an integrated luminosity of 36 pb −1 , collected with the ATLAS detector at the Large Hadron Collider. The fraction of events arising from double-parton (D) interactions, f DP , has been measured through the p T balance between the (D) two jets and amounts to f DP = 0.08 ± 0.01 (stat.) ± 0.02 (sys.) for jets with transverse momentum p T > 20 GeV 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. Abstract. New Journal of Physics 15 (2013) 033038 © CERN 2013 for the benefit of the ATLAS Collaboration, published under the terms of the Creative Commons Attribution 3.0 licence by IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. Any further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation and DOI.