Study of η − η′ mixing from measurement of B [subscript (s)] [superscript 0] → [J over ψη(′)] decay rates
Author(s)
Counts, Ian Thomas Hunt; Ilten, Philip J; Williams, Michael
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A study of B and B[superscript s] meson decays into [J over ψ η] and [J over ψ η′] 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[superscript −1] of integrated luminosity. The decay B[superscript 0] → [J over ψ η′] is observed for the first time. The following ratios of branching fractions are measured:
B(B[superscript 0] → [J over ψη′]) [over B(B[superscript 0][subscript s] → [J over ψη′])] = (2.28±0.65 (stat) ±0.10 (syst) ±0.13 ([fs over fd])) ×10[superscript −2], B(B[superscript 0]→ [J over ψη]) [over B(B[superscript 0][subscript s] → [J over ψη])] = (1.85 ± 0.61 (stat) ± 0.09 (syst) ± 0.11 [(fs over fd)]) ×10[superscript −2], where the third uncertainty is related to the present knowledge of f[subscript s][ over fd], the ratio between the probabilities for a b quark to form a B[superscript s] or a B[superscript 0] meson. The branching fraction ratios are used to determine the parameters of η − η′ meson mixing. In addition, the first evidence for the decay B[superscript s] → ψ(2S)η′ is reported, and the relative branching fraction is measured,
B(B[superscript 0][subscript s] → ψ(2S)η′) [over B(B[superscript 0][subscript s] → [J over ψη′])] =(38.7 ± 9.0 (stat) ± 1.3 (syst) ± 0.9(B)) ×10[superscript −2], where the third uncertainty is due to the limited knowledge of the branching fractions of [J over ψ] and ψ(2S) mesons.
Date issued
2015-01Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, et al. “Study of η − Η′ Mixing from Measurement of B [subscript (s)] [superscript 0] → [J over ψη(′)] Decay Rates.” J. High Energ. Phys. 2015, no. 1 (January 2015).
Version: Final published version
ISSN
1029-8479
1126-6708