Measurement of hard double-parton interactions with the ATLAS detector

The production of W bosons in association with two jets in proton-proton collisions at a centre-of-mass energy of $sqrt{s}$ = 7 TeV has been investigated using data collected with the ATLAS detector. The fraction of events arising from double-parton scattering has been measured through the p$_T$ balance between the two jets. The measurement provides new information on the proton structure and is important to predict the rate of processes such as W+b and same sign WW production.