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A precise measurement of the partial decay width ratio Rb0 = Γbb̄/Γhad

Abstract:
The partial decay width of the Z to bb̄ quark pairs has been measured by the DELPHI detector at LEP using data taken in the years 1992 to 1995. Decays of b-hadrons were tagged by several methods using tracks with large impact parameters and/or reconstructed secondary vertices, complemented by event shape variables. Combining these methods in a multivariate analysis the value Γ(Z → bb̄)/Γ(Z → had) = 0.21634 ± 0.00067 (stat) ± 0.00060 (syst) was obtained, where the cc̄ production fraction was fixed to its Standard Model value.

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Journal:
European Physical Journal C
Volume:
10
Issue:
3
Pages:
415-442
Publication date:
1999-01-01
ISSN:
1434-6044
URN:
uuid:f0d45f3b-4026-4706-9b1d-2ec222c80d30
Source identifiers:
345256
Local pid:
pubs:345256
Language:
English

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