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A search for contact interactions has been performed using dimuon eventsrecorded with the ATLAS detector in proton-proton collisions at sqrt(s) = 7TeV. The data sample corresponds to an integrated luminosity of 42 pb-1. Nosignificant deviation from the Standard Model is observed in the dimuon massspectrum, allowing the following 95% C.L. limits to be set on the energy scaleof contact interactions: Lambda > 4.9 TeV (4.5 TeV) for constructive(destructive) interference in the left-left isoscalar compositeness model.These limits are the most stringent to date for mumuqq contact interactions.

Search for Contact Interactions in Dimuon Events from pp Collisions at sqrt(s) = 7 TeV with the ATLAS Detector