Observation of the Baryonic Flavor-Changing Neutral Current Decay Λ[subscript b][superscript 0]→Λμ[superscript +]μ[superscript -]
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Aaltonen-2011-Observation of the Baryonic Flavor-Changing Neutral Current.pdf
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Author(s)
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Paus, Christoph M. E.
Bauer, Gerry P
Makhoul, Khaldoun
Alternative Title
Observation of the Baryonic Flavor-Changing Neutral Current Decay Λb0→Λμ+μ-
Date Issued
November 2011
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Aaltonen, T. et al. “Observation of the Baryonic Flavor-Changing Neutral Current Decay Λ_{b}^{0}→Λμ^{+}μ^{-}.” Physical Review Letters 107.20 (2011): n. pag. Web. 24 Feb. 2012. © 2011 American Physical Society
Version
Final published version
Abstract
We report the first observation of the baryonic flavor-changing neutral current decay Λ[subscript b][superscript 0]→Λμ[superscript +]μ[superscript -] with 24 signal events and a statistical significance of 5.8 Gaussian standard deviations. This measurement uses a pp̅ collisions data sample corresponding to 6.8 fb[superscript -1] at √s=1.96 TeV collected by the CDF II detector at the Tevatron collider. The total and differential branching ratios for Λ[subscript b][superscript 0]→Λμ[superscript +]μ[superscript -] are measured. We find B(Λ[subscript b][superscript 0]→Λμ[superscript +]μ[superscript -])=[1.73±0.42(stat)±(syst)]×10[superscript -6]. We also report the first measurement of the differential branching ratio of B[subscript s][superscript 0]→ϕμ[superscript +]μ[superscript -], using 49 signal events. In addition, we report branching ratios for B+→K+μ[superscript +]μ[superscript -], B[superscript 0]→K[superscript 0]μ[superscript +]μ[superscript -], and B→K[superscript *](892)μ[superscript +]μ[superscript -] decays.
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/PhysRevLett.107.201802
