  A search for large extra spatial dimensions via virtual-graviton exchange in
the diphoton channel has been carried out with the CMS detector at the LHC. No
excess of events above the standard model expectations is found using a data
sample collected in proton-proton collisions at sqrt(s) = 7 TeV and
corresponding to an integrated luminosity of 36 inverse picobarns. New lower
limits on the effective Planck scale in the range of 1.6-2.3 TeV at the 95%
confidence level are set, providing the most restrictive bounds to date on
models with more than two large extra dimensions.
