TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Henry, L.
AU  - Jashal, B. K.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Remon Alepuz, C.
AU  - Ruiz Vidal, J.
PY  - 2021
DA  - 2021//
TI  - First measurement of the CP-violating phase in B-s(0) -> J/Psi (-> e(+) e(-))phi decays
T2  - Eur. Phys. J. C
JO  - European Physical Journal C
SP  - 1026
EP  - 18pp
VL  - 81
IS  - 11
PB  - Springer
AB  - 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.
SN  - 1434-6044
UR  - https://arxiv.org/abs/2105.14738
UR  - https://doi.org/10.1140/epjc/s10052-021-09711-7
DO  - 10.1140/epjc/s10052-021-09711-7
LA  - English
N1  - WOS:000722225100003
ID  - LHCbCollaborationAaij_etal2021
ER  -