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Jul 4 – 11, 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

Measurement of φs at LHCb

Jul 7, 2012, 4:15 PM
Room 220 (Melbourne Convention and Exhibition Centre)

Room 220

Melbourne Convention and Exhibition Centre

Melbourne Australia
Parallel Sessions Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy Room 220 Lattice QCD / B-Physics / CP Violation, etc -TR5&7&10


Dr Greig Cowan (EPFL (CH))


The determination of the CP-violating phase φs in B0s -> 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 ΔΓs based upon 1.0 fb–1 of data collected at LHCb during 2011. φs can also be measured using the B0s -> J/ψ π π decay mode, which has been shown to be predominantly CP-odd. We present this measurement and the combination of φs from both decay modes.

Primary author

Dr Greig Cowan (EPFL (CH))

Presentation materials