Study of η − η′ mixing from measurement of B [subscript (s)] [superscript 0] → [J over ψη(′)] decay rates
Name
Aaij-2015-Study of eta-eta ' m.pdf
Size
719.61 KB
Format
Adobe PDF
Checksum (MD5)
2769527b307abc1c885f1319e674922c
Author(s)
Counts, Ian Thomas Hunt
Ilten, Philip J
Williams, Michael
Date Issued
January 2015
Journal
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
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/jhep01(2015)024
