Dijets and Missing Energy in ATLAS from a Universal Extra Dimension

In a universal extra dimension scenario, Kaluza-Klein (KK) states of quarks and gluons could be produced at the LHC. In the presence of additional large extra dimensions, these states will decay gravitationally. One possible signal would be an excess of dijets with large accompanying missing energy. We have re-calculated the cross sections for direct production of two partonic KK states, following Macesanu {em et al.}. We then produced a Monte Carlo generator and used it in combination with ATLFAST to evaluate the reach with ATLAS. We find that a compactification scale as high as 2.7 TeV can be probed with an integrated luminosity of 100 fb$^{-1}$.