B-PHYSICS AND CP VIOLATION STUDIES WITH THE CMS DETECTOR

We discuss the potentials of the CMS detector for the study of b-physics and CP violation measurements during the initial low luminosity phase of the LHC. The sensitivity to the unitarity-triangle angle alpha obtained from the time-integrated B --> pipi channel is expected to be delta(sin 2alpha) = 0.082, whilst the sensitivity to the angle beta obtained with the channel B --> (J/psi)K(s)0 is given by delta(sin 2beta) = 0.046. We studied a number of control channels that will be needed to understand the measured asymmetries and which will allow us to monitor the B/BBAR production asymmetry, the dilution factors and the possible experimental biases. Possibilities of b-baryon physics have been investigated. The measurement of the B(s)0-B(s)0BAR oscillation should be achievable for x(s) up to about 30 with the new baseline tracker complemented by a microvertex device. With our best knowledge of the background, the decay B(s)0 --> mumu could be visible after three years of running if BR(B(s)0 --> mumu) > 2.8 x 10(-9).