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Measurement of the rate of b(b)over-bar-b(b)over-bar events in hadronic Z decays and the extraction of the gluon splitting into b(b)over-bar

Abstract:

The rate Z → bb̄bb̄ was measured using about 2×106 hadronic decays collected by the DELPHI experiment in 1994 and 1995. Events were forced into 3-jets with ymin > 0.06 and a b-tag was required for every jet. The rate was measured to be: R4b = BR(Z → bb̄bb̄)/BR(Z → hadrons), = (6.0 ± 1.9(stst.)) ± 1.4(Syst.)) × 10-4 where the invariant mass of every bb̄ system is above twice the b quark mass. Using the value of R4b the probability of secondary production of a bb̄ pair from a gluon per hadro...

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Publication status:
Published

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Journal:
PHYSICS LETTERS B
Volume:
462
Issue:
3-4
Pages:
425-439
Publication date:
1999-09-16
DOI:
ISSN:
0370-2693
URN:
uuid:14ab9263-fbb2-49d7-b362-eb40fc0bac35
Source identifiers:
21772
Local pid:
pubs:21772
Language:
English

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