Speaker
Yasmine Sara Amhis
(Ecole Polytechnique Federale de Lausanne (CH))
Description
The determination of the CP-violating phase φs in Bs → J/ψ φ decays is one of the key goals of the LHCb experiment. Its value is predicted to be very small in the Standard Model but can be significantly enhanced in many models of new physics. We present the world’s best measurement of φs and the first observation of a non-zero ∆Γs based upon ~1 fb−1 of data collected at LHCb during 2011. φs can also be measured using the predominantly CP-odd Bs → J/ψ π π decay mode. We present this measurement and the combination of φs from both J/ψ φ and J/ψ π π decay modes. Additionally we present first results on other Bs decay modes, potentially interesting for complementary measurements of φs, such as Bs → φ φ and Bs → J/ψ K∗0 decays.
Author
Yasmine Sara Amhis
(Ecole Polytechnique Federale de Lausanne (CH))
