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Observation of the Baryonic Flavor-Changing Neutral Current Decay Λ[subscript b][superscript 0]→Λμ[superscript +]μ[superscript -]

Author(s)
Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Paus, Christoph M. E.; Bauer, Gerry P; Makhoul, Khaldoun
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Alternative title
Observation of the Baryonic Flavor-Changing Neutral Current Decay Λb0→Λμ+μ-
Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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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.
Date issued
2011-11
URI
http://hdl.handle.net/1721.1/69197
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
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
ISSN
0031-9007
1079-7114

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