Search for Dijet Resonances in $\sqrt{s}$ = 7 TeV Proton-Proton Collisions with the ATLAS Detector at the LHC

A search for new heavy resonances in two-jet final states is described in this thesis. The data were collected by the ATLAS detector proton-proton collisions at sqrt(s) = 7 TeV and correspond to a time-integrated luminosity of 6.1 pb−1. The background-only hypothesis was tested on the observed data using BumpHunter test statistic. Consistency was found between the observed data and the background-only prediction. No resonant features were observed. A Bayesian approach using binned maximum likelihood was used to set upper limits on the product of cross section and detector acceptance for excited-quark (q∗) production as a function of q∗ mass. At 95% credibility level (CL), the q∗ mass in the interval of 0.50 TeV < mq∗ < 1.62 TeV is excluded, extending the reach of previous experiments.