  A search for resonances decaying to top quark-antiquark pairs is performed
using a dilepton+jets data sample recorded by the CMS experiment at the LHC in
pp collisions at sqrt(s) = 7 TeV corresponding to an integrated luminosity of
5.0 inverse femtobarns. No significant deviations from the standard model
background are observed. Upper limits are presented for the production cross
section times branching fraction of top quark-antiquark resonances for masses
from 750 to 3000 GeV. In particular, the existence of a leptophobic topcolor
particle Z' is excluded at the 95% confidence level for resonance masses M[Z']
< 1.3 TeV for Gamma[Z'] = 0.012 M[Z'], and M[Z'] < 1.9 TeV for Gamma[Z'] = 0.10
M[Z'].

High Energy Physics - Experiment