Update of the Search for New Physics in the Dijet Mass Distribution in 163 pb^-1 of pp Collisions at sqrt(s) = 7 TeV Measured with the ATLAS Detector

We present a search for new physics in the dijet mass distribution using 163 pb^-1 of data collected in 2011 with the ATLAS detector. In this update of the result described in [1] the analysis underwent only minor modifications, such as those due to changes in the trigger. No resonances were found in the updated sample. We improved the limits set on the product of cross section and acceptance for excited-quark (q*) and axigluon production as a function of q* and axigluon mass. These exclude at the 95% CL the q* mass interval 0.80 < mq* < 2.50 TeV and the axigluon mass interval 0.80 < m < 2.67 TeV. Production cross section limits as a function of dijet mass are also set using a simplified Gaussian signal model to facilitate comparisons with other hypotheses.