Evidence for the Strangeness-Changing Weak Decay Ξ−b→Λ0bπ−
Publication date
2015-12-11Abstract
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 Ξ−b→Λ0bπ−. 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 fΞ−bfΛ0bB(Ξ−b→Λ0bπ−)=(5.7±1.8+0.8−0.9)×10−4,where fΞ−b and fΛ0b are the b→Ξ−b and b→Λ0b fragmentation fractions, and B(Ξ−b→Λ0bπ−) is the branching fraction. Assuming fΞ−b/fΛ0b is bounded between 0.1 and 0.3, the branching fraction B(Ξ−b→Λ0bπ−) would lie in the range from (0.57±0.21)% to (0.19±0.07)%.
Document Type
Article
Published version
Language
English
Subject (CDU)
53 - Physics
Keywords
Pages
10 p.
Publisher
American Physical Society
Is part of
Physical Review Letters, 2015, Vol. 115, No. 24 (Desembre)
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Rights
© CERN
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by/4.0/