  An updated search for heavy narrow resonances decaying to muon or electron
pairs using the CMS detector is presented. Data samples from pp collisions at
sqrt(s) = 7 TeV and 8 TeV at the LHC, with integrated luminosities of up to 5.3
and 4.1 inverse femtobarns, respectively, are combined. No evidence for a heavy
narrow resonance is observed. The analysis of the combined data sets excludes,
at 95% confidence level, a Sequential Standard Model Z'[SSM] resonance lighter
than 2590 GeV, a superstring-inspired Z'[psi] lighter than 2260 GeV, and
Kaluza-Klein gravitons lighter than 2390 (2030) GeV, assuming that the coupling
parameter k/M-bar[Pl] is 0.10 (0.05). These are the most stringent limits to
date.
