  A new measurement of the inclusive production cross section for pp to t t-bar
is performed at a center-of-mass energy of 7 TeV using data collected by the
CMS experiment at the LHC. The analysis uses a data sample corresponding to an
integrated luminosity of 36 inverse picobarns, and is based on the final state
with one isolated, high transverse momentum muon or electron, missing
transverse energy, and hadronic jets. The ttbar content of the selected events
is enhanced by requiring the presence of at least one jet consistent with
b-quark hadronization. The measured cross section is 150 +/- 9 (stat.) +/- 17
syst.) +/- 6 (lumi.) pb and is in agreement with higher-order QCD calculations.
The combination of this measurement with a previous CMS result based on
dileptons gives 154 +/- 17 (stat.+syst.) +/- 6 (lumi.) pb.
