Evidence for the Strangeness-Changing Weak Decay Ξ [− over b] → Λ[0 over b]π[superscript −]
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PhysRevLett.115.241801.pdf
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Author(s)
Aaij, R.
Abellán Beteta, C.
Adeva, B.
Adinolfi, M.
Affolder, A.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Date Issued
December 2015
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., C. Abellan Beteta, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, et al. “Evidence for the Strangeness-Changing Weak Decay Ξ [− over b] → Λ[0 over b]π[superscript −].” Physical Review Letters 115, no. 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[superscript -1], collected by the LHCb detector, we present the first search for the strangeness-changing weak decay Ξ[- over b] → Λ[0 over b]π[superscript -]. 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 [f[subscript Ξ[- over b] over f[subscript Λ[0 over b]]B(Ξ[- over b] → Λ[0 over b]π[superscript -]) = (5.7 ± 1.8[+0.8 over -0.9] × 10[superscript -4]},where f[subscript Ξ[- over b] and f[subscript Λ[0 over b] are the b → Ξ[- over b] and b → Λ[0 over b] fragmentation fractions, and B(Ξ[- over b] → Λ[0 over b]π[superscript -]) is the branching fraction. Assuming f[subscript Ξ[- over b]/[subscript Λ[0 over b] is bounded between 0.1 and 0.3, the branching fraction B(Ξ[- over b] → Λ[0 over b]π[superscript -]) would lie in the range from (0.57 ± 0.21)% to (0.19 ± 0.07)%.
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
http://dx.doi.org/10.1103/PhysRevLett.115.241801
