A measurement of the fraction of hadronic Z decays in which a gluon splits into a bb¯ pair, gbb¯, 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 gbb¯=(2.77+/-0.42(stat)+/-0.57(syst))x10- 3.
A measurement of the gluon splitting rate into pairs in hadronic Z decays
GREGORIO, ANNA;GIANNINI, GIANROSSANO;
1998-01-01
Abstract
A measurement of the fraction of hadronic Z decays in which a gluon splits into a bb¯ pair, gbb¯, 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 gbb¯=(2.77+/-0.42(stat)+/-0.57(syst))x10- 3.File in questo prodotto:
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