We present results of a signature-based search for new physics using a dijet plus missing transverse energy (${\cancel{E}}_T$) data sample collected in $2{\mathrm{fb}}^{-1}$ of $p\overline{p}$ collisions at $\sqrt{s}=1.96\mathrm{TeV}$ with the CDF II detector at the Fermilab Tevatron. We observe no significant event excess with respect to the standard model prediction and extract a 95% C.L. upper limit on the cross section times acceptance for a potential contribution from a nonstandard model process. The search is made by using novel, data-driven techniques for estimating backgrounds that are applicable to first searches at the LHC.

• Received 4 February 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.131801