Evidence for the Strangeness-Changing Weak DecayΞ[subscript b][superscript −] → Λ[subscript b][superscript 0]π[superscript −]
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PhysRevLett.115.241801.pdf
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Author(s)
LHCb Collaboration
Ilten, Philip J
Williams, Michael
Date Issued
December 2015
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Aaij, R. et al. “Evidence for the Strangeness-Changing Weak DecayΞ[subscript b][superscript −] → Λ[subscript b][superscript 0]π[superscript −].” Physical Review Letters 115, 24 (December 2015) © 2015 CERN for the LHCb Collaboration.
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Final published version
Abstract
Using a pp collision data sample corresponding to an integrated luminosity of 3.0 fb-1, collected by the LHCb detector, we present the first search for the strangeness-changing weak decay Ξb-→Λb0π-. No b hadron decay of this type has been seen before. A signal for this decay, corresponding to a significance of 3.2 standard deviations, is reported. The relative rate is measured to be fΞb-fΛb0B(Ξb-→Λb0π-)=(5.7±1.8-0.9+0.8)×10-4,where fΞb- and fΛb0 are the b→Ξb- and b→Λb0 fragmentation fractions, and B(Ξb-→Λb0π-) is the branching fraction. Assuming fΞb-/fΛb0 is bounded between 0.1 and 0.3, the branching fraction B(Ξb-→Λb0π-) would lie in the range from (0.57±0.21)% to (0.19±0.07)%.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PHYSREVLETT.115.241801
