Measurement of lambda(b) production and lifetime in Z0 hadronic decays
Collaboration
14 pages
Published in:
- Phys.Lett.B 311 (1993) 379-390
Report number:
- CERN-PPE-93-32
Experiments:
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Abstract: (Elsevier)
Evidence for the production of b -flavoured baryons in Z 0 decays is reported from the analysis of 365 000 hadronic events collected by the DELPHI detector. Assuming that most of the weakly decaying b flavoured baryons produced by the Z 0 are Λ b , the observed signal of (Λ − + Λ l + ) pairs, where l is a high transverse momentum lepton in the same jet as the Λ, leads to a production rate: f ( b → Λ b )×Br( Λ b → Λlν X ) = (0.41±0.13±0.09)%. Using a sample of 18 reconstructed Λ b decay vertices, the lifetime is determined to be τ ( Λ b ) = (1.04 +0.48 −0.38 ±0.10) ps.- electron positron: colliding beams
- colliding beams: electron positron
- electron positron: annihilation
- annihilation: electron positron
- Z0: electroproduction
- electroproduction: Z0
- bottom: pair production
- pair production: bottom
- bottom: fragmentation
- DELPHI
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