Measurement of the Gamma (b anti-b) / Gamma (hadron) branching ratio of the Z by double hemisphere tagging - INSPIRE

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Measurement of the Gamma (b anti-b) / Gamma (hadron) branching ratio of the Z by double hemisphere tagging

DELPHI

Collaboration

Aug, 1994

26 pages

Published in:

Z.Phys.C 65 (1995) 555-568

DOI:

10.1007/BF01578666

Report number:

CERN-PPE-94-131

Experiments:

CERN-LEP-DELPHI

View in:

CERN Document Server

reference search86 citations

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Abstract: (Springer)

Two measurements of

\Gamma _{b\bar b} /\Gamma _{had}

are presented. Both measurements use 250000Z 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\bar b} /\Gamma _{had}

is found to be 0.2209±0.0041(stat.)±0.0042(syst.)±0.0018

\Gamma _{c\bar c}

.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
Z0: electroproduction
electroproduction: Z0
Z0: nonleptonic decay
nonleptonic decay: Z0
Z0: branching ratio
bottom: pair production

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