$(b\overline{b})$ and $(c\overline{c})$ resonances detection in Pb-Pb collisions at CMS

The CMS ( Compact Muon Solenoid) detector, designed for p-p collisons, is characterized by a very good muon system and a very high quality central tracker. Its use with heavy ion beams is proposed to detect the ( c-cbar) and ( b-bbar) resonant states through their muon decay channel. For this purpose, the advantages of CMS concern the large acceptances and the excellent mass resolution. The efficiencies for tracks reconstruction and vertex finding are estimated. The signal/background ratios are estimated for minimum bias Pb-Pb collisions with the hardest predicted hadronic multiplicity, i.e dN+-/dy=8000. It is shown that these ratios, at least of the order of 1, can be twice higher if the rapidity range detection is restricted to the barrel. The dimuon mass spectra and the expected rates after one month of running time are presented.