  Results are presented from a search for large, extra spatial dimensions in
events with either two isolated muons or two isolated electrons. The data are
from proton-proton interactions at sqrt(s) = 7 TeV collected with the CMS
detector at the LHC. The size of the data sample corresponds to an integrated
luminosity of approximately 2 inverse femtobarns. The observed dimuon and
dielectron mass spectra are found to be consistent with standard-model
expectations. Depending on the number of extra dimensions, the 95% confidence
level limits from the combined dimuon and dielectron channels range from Ms >
2.4 TeV to Ms > 3.8 TeV, where Ms characterizes the scale for the onset of
quantum gravity.
