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Abstract
A search for new heavy particles manifested as resonances in two-jet final states
is presented. The data were produced in 7 TeV proton-proton collisions by the Large
Hadron Collider (LHC) and correspond to an integrated luminosity of 315 nb^-1 collected
by the ATLAS detector. No resonances were observed. Upper limits were set on the product
of cross section and signal acceptance for excited-quark (q*) production as a function
of q* mass. These exclude at the 95% CL the q* mass interval 0.30 < mq* < 1.26 TeV,
extending the reach of previous experiments.