First measurement of the CP-violating phase in B0s→J/ψ( → e+e−)ϕ decays

K. De Bruyn, C. J. G. Onderwater, M. van Veghel, LHCb Collaboration

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2 Citaten (Scopus)
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A flavour-tagged time-dependent angular analysis of B-s(0) -> J/Psi phi decays is presented where the J/Psi 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 8TeV, corresponding to an integrated luminosity of 3 fb(-1). The CP-violating phase and lifetime parameters of the B-s(0) s system are measured to be phi(s) = 0.00 +/- 0.28 +/- 0.07 rad, Delta Gamma(s) = 0.115 +/- 0.045 +/- 0.011 ps(-1) and Delta Gamma(s) = 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 B-s(0) -> J/Psi phi 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.

Originele taal-2English
Aantal pagina's18
TijdschriftEuropean Physical Journal C
Nummer van het tijdschrift11
StatusPublished - 24-nov.-2021

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