  A search for microscopic black holes in pp collisions at a center-of-mass
energy of 7 TeV is presented. The data sample corresponds to an integrated
luminosity of 4.7 inverse femtobarns recorded by the CMS experiment at the LHC
in 2011. Events with large total transverse energy have been analyzed for the
presence of multiple energetic jets, leptons, and photons, which are typical
signals of evaporating semiclassical and quantum black holes, and string balls.
Agreement with the expected standard model backgrounds, which are dominated by
QCD multijet production, has been observed for various combined multiplicities
of jets and other reconstructed objects in the final state. Model-independent
limits are set on new physics processes producing high-multiplicity, energetic
final states. In addition, new model-specific indicative limits are set
excluding semiclassical and quantum black holes with masses below 3.8 to 5.3
TeV and string balls with masses below 4.6 to 4.8 TeV. The analysis has a
substantially increased sensitivity compared to previous searches.
