B-physics performance of the CMS detector

Abstract

We describe the CMS detector, with special attention to its microvertex pixel detector. Then, we discuss the potential of the CMS detector for the study of CP violation; the sensitivity to the unitarity triangle angle β obtained from the B d 0 → J ψK s 0 channel is 0.048 from a time-integrated analysis and 0.046 from a time-dependent analysis; the corresponding values for the angle α obtained from the B d 0 → π + π − channel are 0.050 and 0.070, respectively. We also discuss the possibilities to observe B s 0 oscillations and some rare decays.