Observation of a Resonance in B[superscript +]→K[superscript +]μ[superscript +]μ[superscript -] Decays at Low Recoil
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[sup...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2013
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| Online Access: | http://hdl.handle.net/1721.1/81344 https://orcid.org/0000-0001-8285-3346 |
| Summary: | 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. |
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