Observation of a Resonance in B[superscript +]→K[superscript +]μ[superscript +]μ[superscript -] Decays at Low Recoil
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Aaij-2013-Observation of a res.pdf
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Author(s)
Williams, Michael
Date Issued
September 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. “Observation of a Resonance in B^{+}→K^{+}μ^{+}μ^{-} Decays at Low Recoil.” Physical Review Letters 111, no. 11 (September 2013). © 2013 CERN
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Final published version
Abstract
A broad peaking structure is observed in the dimuon spectrum of B[superscript +]→K[superscript +]μ[superscript +]μ[superscript -] decays in the kinematic region where the kaon has a low recoil against the dimuon system. The structure is consistent with interference between the B[superscript +]→K[superscript +]μ[superscript +]μ[superscript -] decay and a resonance and has a statistical significance exceeding six standard deviations. The mean and width of the resonance are measured to be 4191[+9 over -8] MeV/c[superscript 2] and 65[+22 over -16] MeV/c[superscript 2], respectively, where the uncertainties include statistical and systematic contributions. These measurements are compatible with the properties of the ψ(4160) meson. First observations of both the decay B[superscript +]→ψ(4160)K[superscript +] and the subsequent decay ψ(4160)→μ[superscript +]μ[superscript -] are reported. The resonant decay and the interference contribution make up 20% of the yield for dimuon masses above 3770 MeV/c[superscript 2]. This contribution is larger than theoretical estimates.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.111.112003
