A
study of B and B-s(0) meson decays into J/psi eta and J/psi eta' final
states is performed using a data set of proton-proton collisions at
centre-of-mass energies of 7 and 8 TeV, collected by the LCHb experiment
and corresponding to 3.0 fb(-1) of integrated luminosity. The decay B-0
-> J/psi eta' is observed for the first time. The following ratios
of branching fractions are measured:
B(B-0 -> J psi eta')/B(B-s(0) -> J psi eta') = (2.28 +/- 0.65
(stat) +/- 0.010 (syst) +/- 0.13 (f(s)/f(d)) x 10(-2) ,
B(B-0 -> J psi eta')/B(B-s(0) -> J psi eta') = (1.85 +/- 0.65
(stat) +/- 0.09 (syst) +/- 0.11 (f(s)/f(d)) x 10(-2)
where the third uncertainty is related to the present knowledge of
f(s)/f(d), the ratio between the probabilities for a b quark to form a
B-s(0) or a B-0 meson. The branching fraction ratios are used to
determine the parameters of eta-eta' meson mixing. In addition, the
first evidence for the decay B-s(0) -> p…
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