Observation of Bs0→J/ψK*(892)0 [B subscript s superscript 0 → J / psi K* (892) superscript 0] and Bs0→J/ψKS0 [B subscript s superscript 0 → J / psi K subscript s superscript 0 ] decays
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Aaltonen-2011-Observation of B-s(0.pdf
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Author(s)
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Makhoul, Khaldoun
Paus, Christoph M. E.
Bauer, Gerry P
Date Issued
March 2011
Journal
Physical review D
Publisher
American Physical Society
Citation
Aaltonen, T. et al. "Observation of Bs0→J/ψK*(892)0 and Bs0→J/ψKS0 decays" Phys. Rev. D 83, 052012 (2011) © 2011 American Physical Society
Version
Final published version
Abstract
We report the first observation of two Cabibbo-suppressed decay modes of the Bs0 [B subscript s superscript 0] meson. Using a sample of pp̅ collisions at √s=1.96 [square root of 1.96] TeV corresponding to 5.9 fb-1 [fb superscript -1] of integrated luminosity collected with the CDF II, the collider detector at the Fermilab Tevatron, we search for new Bs0 [B subscript s superscript 0] decay modes in a sample of events containing J/ψ→μ+μ- [J / psi→mu superscript + mu superscript -] decays. We reconstruct a Bs0→J/ψK*(892)0 [B subscript s superscript 0→J / psi K subscript s superscript 0] signal with K*(892)0→K+π- [K* (892) superscript 0 →K superscript + pi superscript -], observing a yield of 151±25 events with a statistical significance of 8.0σ [8.0 delta]. We also reconstruct a Bs0→J/ψKS0 [B subscript s superscript 0→J / psi K subscript s superscript 0] signal with KS0→π+π- [K subscript s superscript 0→ pi superscript + pi superscript -], observing a yield of 64±14 events with a statistical significance of 7.2σ [7.2 delta]. From these yields, we extract the branching ratios B(Bs0→J/ψK*(892)0)=(8.3±3.8)×10-5 [B (B subscript s superscript 0→J / psi K* (892) superscript 0) = (8.3±3.8) × 10 superscript -5] and B(Bs0→J/ψK0)=(3.5±0.8)×10-5 [B (B subscript s superscript 0→J / psi K superscript 0) = (3.5 ± 0.8) × 10 superscript -5], where statistical, systematic, and fragmentation-fraction uncertainties are included in the combined uncertainty.
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/10.1103/PhysRevD.83.052012
