Evidence for b baryons in Z decays
Collaboration
8 pages
Published in:
- Phys.Lett.B 278 (1992) 209-216
- Published: 1992
Report number:
- CERN-PPE-91-229
Experiments:
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Abstract: (Elsevier)
In 160 000 hadronic Z decays recorded with the ALEPH detector at LEP, the yields of Λ ℓ − and Λ ℓ + combinations have been measured. The observed excess of Λ ℓ − over Λ ℓ + of 53±13 is interpreted as evidence for b baryons and their semileptonic decay. Assuming that three body decay processes such as Λ b →Λ c + ℓ − v dominate the semileptonic decay of b baryons, this ex cess corresponds to a product branching ratio BR ( b →Λ b )· BR (Λ b →Λ c + ℓ − v )· BR (Λ c + →ΛX) = (0.95±0.22 ( stat. )±0.21( syst. ))% , where Λ b and Λ c + denote the bottom and charm baryons respectively.- electron positron: colliding beams
- colliding beams: electron positron
- electron positron: annihilation
- annihilation: electron positron
- Z0: electroproduction
- electroproduction: Z0
- Z0: nonleptonic decay
- nonleptonic decay: Z0
- final state: (Lambda lepton-)
- (Lambda lepton-): final state
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