Search for New Physics in the Dijet Mass Distribution using 1 fb$^-1$ of $pp$ Collision Data at $\sqrt{s}$ = 7 TeV collected by the ATLAS Detector
- Aad, Georges et al
- arXiv:1108.6311CERN-PH-EP-2011-127
 | The reconstructed dijet mass distribution (filled points) fitted with a smooth functional form describing the QCD background. The bin-by-bin significance of the data-background difference is shown in the lower panel. Vertical lines show the most significant excess found by the \BumpHunter\ algorithm (see text). |
 | Excited-quark and axigluon models.Colour octet scalar model. |
 | The 95\% CL upper limits on $\sigma\times {\cal A}$ as a function of particle mass (black filled circles). The black dotted curve shows the 95\% CL upper limit expected from Monte Carlo and the light and dark yellow shaded bands represent the 68\% and 95\% contours of the expected limit, respectively. Theoretical predictions for $\sigma\times {\cal A}$ are shown in (a) for excited quarks (blue dashed) and axigluons (green dot-dashed), and in (b) for colour octet scalar resonances (blue dashed). For a given new physics model, the observed (expected) limit occurs at the crossing of its $\sigma\times {\cal A}$ curve with the observed (expected) 95\% CL upper limit curve.Caption not extracted |
 | The 95\%\ CL upper limits on $\sigma\times {\cal A}$ for a simple Gaussian resonance decaying to dijets as a function of the mean mass, $m_{\text{G}}$, for four values of $\sigma_{\text{G}}/m_{\text{G}}$, taking into account both statistical and systematic uncertainties. |