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First measurement of the CP -violating phase in Bs0→J/ψ(→ e+e-) ϕ decays

Published version
Peer-reviewed

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Type

Article

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Authors

Aaij, R 
Abellán Beteta, C 
Ackernley, T 
Adeva, B 
Adinolfi, M 

Abstract

A flavour-tagged time-dependent angular analysis of Bs0→J/ψϕ decays is presented where the J/ψ meson is reconstructed through its decay to an e+e pair. The analysis uses a sample of pp collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. The CP-violating phase and lifetime parameters of the Bs0 system are measured to be ϕs=0.00±0.28±0.07 rad, ΔΓs=0.115±0.045±0.011 ps−1 and Γs=0.608±0.018±0.012 ps−1 where the first uncertainty is statistical and the second systematic. This is the first time that CP-violating parameters are measured in the Bs0→J/ψϕ decay with an e+e pair in the final state. The results are consistent with previous measurements in other channels and with the Standard Model predictions.

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Keywords

hep-ex, hep-ex

Journal Title

European Physical Journal C

Conference Name

Journal ISSN

1434-6044
1434-6052

Volume Title

81

Publisher

Springer Science and Business Media LLC