Observation of the decay [bar over B][0 over s] → ψ(2S)K[superscript +]π[superscript −]
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Author(s)
Counts, Ian Thomas Hunt
Williams, Michael
Ilten, Philip J
Date Issued
June 2015
Journal
Physics Letters B
Publisher
Elsevier
Citation
Aaij, R., et al. “Observation of the Decay [bar over B][0 over s] → ψ(2S)K[superscript +]π[superscript −].” Physics Letters B 747 (July 2015): 484–494. © 2015 CERN for the benefit of the LHCb Collaboration
Version
Final published version
Abstract
The decay [bar over B][0 over s] → ψ(2S)K[superscript +]π[superscript −] is observed using a data set corresponding to an integrated luminosity of 3.0 fb[superscript −1] collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV. The branching fraction relative to the B[superscript 0] → ψ(2S)K[superscript +]π[superscript −] decay mode is measured to be
[B([bar over B][0 over s] → ψ(2S)K[superscript +]π[superscript −]) over B[superscript 0] → ψ(2S)K[superscript +]π[superscript −] = 5.38 ± 0.36(stat) ± 0.22(syst) ± 0.31(f[subscript s]/f[subscript d])%,
where f[subscript s]/f[subscript d] indicates the uncertainty due to the ratio of probabilities for a b quark to hadronise into B[0 over s] or B[superscript 0] meson. Using an amplitude analysis, the fraction of decays proceeding via an intermediate K[superscript ⁎](892)[superscript 0] meson is measured to be 0.645 ± 0.049(stat) ± 0.049(syst) and its longitudinal polarisation fraction is 0.524 ± 0.056(stat) ± 0.029(syst). The relative branching fraction for this component is determined to be
[B([bar over B][0 over s] → ψ(2S)K[superscript *](892)[superscript 0]) over B(B[superscript 0 → ψ(2S)K[superscript *](892)[superscript 0]]
In addition, the mass splitting between the B[0 over s] and B[superscript 0] mesons is measured as
M(B[0 over s]) − M(B[superscript 0]) = 87.45 ± 0.44(stat) ± 0.09(syst) MeV/c[superscript 2].
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2015.06.038
