Searches for new particles decaying into jet pairs in ATLAS data

Results are presented on the search for new physics in the dijet mass and angular distributions using data collected in 2010 and 2011 with the ATLAS detector. Results of searches in dijet angular distributions with 36 pb −1 of data are taken from [1], whilst new results of searches in dijet mass distributions with 163 pb−1 of data collected in 2011 are shown for the first time [2]. No evidence for resonances was found in the updated sample. Improved limits are 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∗ < 2.49 TeVand 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.