@Article{LHCbCollaborationAaij_etal2015,
author="LHCb Collaboration (Aaij, R. et al
and Martinez-Vidal, F.
and Oyanguren, A.
and Ruiz Valls, P.
and Sanchez Mayordomo, C.",
title="Study of eta-eta {\textquoteright} mixing from measurement of B-(s)(0) -> J/psi eta(({\textquoteright})) decay rates",
journal="Journal of High Energy Physics",
year="2015",
publisher="Springer",
volume="01",
number="1",
pages="024--24pp",
optkeywords="Spectroscopy; Hadron-Hadron Scattering; QCD; Branching fraction; B physics",
abstract="A study of B and B-s(0) meson decays into J/psi eta and J/psi eta{\textquoteright} 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{\textquoteright} is observed for the first time. The following ratios of branching fractions are measured: B(B-0 -> J psi eta{\textquoteright})/B(B-s(0) -> J psi eta{\textquoteright}) = (2.28 +/- 0.65 (stat) +/- 0.010 (syst) +/- 0.13 (f(s)/f(d)) x 10(-2) , B(B-0 -> J psi eta{\textquoteright})/B(B-s(0) -> J psi eta{\textquoteright}) = (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{\textquoteright} meson mixing. In addition, the first evidence for the decay B-s(0) -> psi(2S){\textquoteright} is reported, and the relative branching fraction is measured, B(B-s(0) -> psi(2S)eta{\textquoteright})/B(B-s(0) -> J psi eta{\textquoteright}) = (38.7 +/- 9.0 (stat) +/- 1.3 (syst) +/- 0.9(B)) x 10(-2), where the third uncertainty is due to the limited knowledge of the branching fractions of J/psi and psi(2S) mesons.",
optnote="WOS:000347685500001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2077), last updated on Thu, 05 Feb 2015 15:02:42 +0000",
issn="1029-8479",
doi="10.1007/JHEP01(2015)024",
opturl="http://arxiv.org/abs/1411.0943",
opturl="https://doi.org/10.1007/JHEP01(2015)024",
archivePrefix="arXiv",
eprint="1411.0943",
language="English"
}