Speaker
Mr.
Giacomo Fedi
(University of Helsinki)
Description
In this talk we present a measurement of the time-dependent CP-violating phase phi_s in the decays of B_s -> J/psi phi. The phase phi_s is the key parameter for the CP-violation of the B_s and anti-B_s system. An angular and proper decay time analysis is applied to the Bs->J/psi phi events. Using a data sample collected by the CMS experiment, the Bs signal candidates are reconstructed and are used to extract the phase phi_s. The theoretical prediction of the phi_s angle is particularly robust, thus any deviation from the prediction can be a smoking gun signal of new physics. A similar decay, B_s->J/psi f0 can also provide the information on the same mixing phase. This talk might also include the study of lifetime in B_s->J/psi f0 decays, if approved in time.
Primary author
Arnd Meyer
(RWTH Aachen University)
