2-9 July 2014
Valencia, Spain
Europe/Madrid timezone

Measurement of the CP-violating phase phi_s in the B_s->J/psi phi decays at CMS

4 Jul 2014, 10:10
Sala 8+9 ()

Sala 8+9

Oral presentation Flavour Physics Flavour Physics


Mr. Giacomo Fedi (University of Helsinki)


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)

Presentation Materials


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