Title
Measurement of the gamma(b-b-over-bar)/gamma(had) branching ratio of the z by double hemisphere tagging Measurement of the gamma(b-b-over-bar)/gamma(had) branching ratio of the z by double hemisphere tagging
Author
Publication type
article
Publication
Berlin ,
Subject
Physics
Source (journal)
Zeitschrift für Physik : C : particles and fields. - Berlin
Volume/pages
65() :4 , p. 555-568
ISSN
0170-9739
ISI
A1995QL10800001
Carrier
E
Target language
English (eng)
Abstract
Two measurements of Gamma(b ($) over bar b)/Gamma(had) are presented. Both measurements use 250000 Z decays taken with the DELPHI detector in 1991 and rely mainly on the precision of the microvertex detector. One tagging method is as simple as possible so that background rates can be reliably predicted by simulation. The other one uses a more involved tagging technique and reduces the dependence on simulation as much as possible. Combining both results, Gamma(b ($) over bar b)/Gamma(had) is found to be 0.2209 +/- 0.0041 (stat.) +/- 0.0042(syst.) +/- 0.0018 (Gamma(c ($) over bar c)).
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