A Measurement of the gluon splitting rate into b anti-b pairs in hadronic Z decays

Barate, R.; Buskulic, D.; Decamp, D.; Ghez, Philippe; Goy, C.; Lees, J.P.; Lucotte, A.; Merle, E.; Minard, M.N.; Nief, J.Y.

doi:10.1016/S0370-2693(98)00850-8

A Measurement of the gluon splitting rate into b anti-b pairs in hadronic Z decays

ALEPH

Collaboration

Jun, 1998

15 pages

Published in:

Phys.Lett.B 434 (1998) 437-450

DOI:

10.1016/S0370-2693(98)00850-8

Report number:

CERN-EP-98-103

Experiments:

CERN-LEP-ALEPH

View in:

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Abstract: (Elsevier)

A measurement of the fraction of hadronic Z decays in which a gluon splits into a b b ̄ pair, g b b ̄ , is presented using data collected by ALEPH from 1992 to 1995 at the Z resonance. The selection is based on four-jet events. Events are selected by means of topological cuts and a lifetime tag. The result is g b b ̄ =(2.77±0.42 (stat)±0.57 (syst))×10 −3 .

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
Z0: hadronic decay
gluon: fragmentation
bottom: pair production
final state: (4jet)
ALEPH
experimental results
CERN LEP Stor

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