A measurement of the product branching ratio f(b→Λb)⋅BR(Λb→ΛX) in Z0 decays

Kartvelishvili, Vakhtang (1999) A measurement of the product branching ratio f(b→Λb)⋅BR(Λb→ΛX) in Z0 decays. European Physical Journal C: Particles and Fields, 9 (1). pp. 1-9. ISSN 1434-6044

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Abstract

The product branching ratio, f(b→Λb)⋅BR(Λb→ΛX)f(b→Λb)⋅BR(Λb→ΛX) , where ΛbΛb denotes any weakly-decaying b–baryon, has been measured using the OPAL detector at LEP. ΛbΛb 's are selected by the presence of energetic ΛΛ particles in bottom events tagged by the presence of displaced secondary vertices. A fit to the momenta of the ΛΛ particles separates signal from B meson and fragmentation backgrounds. The measured product branching ratio is f(b → Λb) · BR(Λb → ΛX) = (2.67) ± 0.38(stat)+0.67−0.60(sys))%. Combined with a previous OPAL measurement, one obtains f(b → Λb) · BR(Λb → ΛX) = (3.50) ± 0.32(stat) ± 0.35(sys))%.

Item Type:
Journal Article
Journal or Publication Title:
European Physical Journal C: Particles and Fields
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2201
Subjects:
ID Code:
82821
Deposited By:
Deposited On:
14 Nov 2016 10:20
Refereed?:
Yes
Published?:
Published
Last Modified:
12 Aug 2020 05:40