CERN Accelerating science

ATLAS Note
Report number	ATL-PHYS-PROC-2013-334
Title	Measurement of hard double-parton interactions with the ATLAS detector
Author(s)	Martin, T A D (Warwick U.)
Corporate Author(s)	The ATLAS collaboration
Publication	2013
Imprint	12 Dec 2013
Number of pages	7
In:	PoS Photon2013 (2013) pp.033
In:	International Conference On The Structure And Interactions Of The Photon and 20th International Workshop On Photon-Photon Collisions, Paris, France, 20 - 24 May 2013, pp.033
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	MPI ; DPS ; W+Jets ; QCD
Abstract	The production of a W boson in association with two jets was studied in proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 7$ TeV with the ATLAS detector. Data corresponding to an integrated luminosity of 36 pb$^{-1}$ were analysed for the presence of double-parton interactions. The fraction of events arising from double-parton interactions was extracted using the momentum balance of the two jets and was evaluated to be $f_{\rm DP}^{\rm Detector} = 0.08 \pm 0.01 ({\rm stat.}) \pm 0.02 ({\rm syst.})$ for jets with transverse momentum $p_{\rm T} > 20 $ GeV and rapidity $|y| < 2$. This is expressed as a measure of the effective area parameter for hard double-parton interactions, $\sigma_{\rm eff} = 15 \pm 3 ({\rm stat.}) ^{+5}_{-3} ({\rm syst.})$ mb.
Copyright/License	Preprint: (License: CC-BY-4.0)

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