CMS will be able to discover the Higgs boson in the whole mass range
where the Standard Model predicts its existence
(~100 GeV <mh< ~1 TeV). The excellent performance of the
crystal electromagnetic calorimeter makes the discovery of the light Higgs
boson (mh <140 GeV) feasible via its two-photon decay channel.
The mass range up to 600-700 GeV can be studied by the channel
H -> ZZ(Z*) -> 4l due to the precision measurements of the lepton momenta.
If contrary to the modern expectation the Higgs mass will be in
the range mh ~ 800-1000 GeV it will be discovered by a
combination of observations over a number of channels
(H -> ZZ -> ll,
lljj;
H -> WW -> ljj). In this case, the hermiticity and the advantage of the hadron
calorimeter are important.
