  We present the results of a search for new physics in the jets plus missing
transverse energy data sample collected from 368 pb^{-1} of ppbar collisions at
sqrt{s}=1.96 TeV recorded by the Collider Detector at Fermilab. We compare the
number of events observed in the data with a data-based estimate of the
Standard Model backgrounds contributing to this signature. We observe no
significant excess of events, and we interpret this null result in terms of
lower limits on the fundamental Planck scale for a large extra dimensions
scenario.
