  We examine whether the ATLAS detector has sensitivity to extra-dimensional
scalars (as opposed to components of higher-dimensional tensors which look like
4D scalars), in scenarios having the extra-dimensional Planck scale in the TeV
range and $n \ge 2$ nonwarped extra dimensions. Such scalars appear as partners
of the graviton in virtually all higher-dimensional supersymmetric theories.
Using the scalar's lowest-dimensional effective couplings to quarks and gluons,
we compute the rate for the production of a hard jet together with missing
energy. We find a nontrivial range of graviscalar couplings to which ATLAS
could be sensitive, with experiments being more sensitive to couplings to
gluons than to quarks. Graviscalar emission increases the missing-energy signal
by adding to graviton production, and so complicates the inference of the
extra-dimensional Planck scale from an observed rate. Because graviscalar
differential cross sections resemble those for gravitons, it is unlikely that
these can be experimentally distinguished from one another should a missing
energy signal be observed.
