A measurement of the fraction of hadronic Z decays in which a, gluon splits into a b (b) over bar pair, g(), 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() = (2.77 +/- 0.42(stat) +/- 0.57(syst)) x 10(-3). (C) 1998 Elsevier Science B.V. All rights reserved.
A measurement of the gluon splitting rate into b(b)over-bar pairs in hadronic Z decays
SELVAGGI, Giovanna;DE PALMA, Mauro;NUZZO, Salvatore Vitale
1998-01-01
Abstract
A measurement of the fraction of hadronic Z decays in which a, gluon splits into a b (b) over bar pair, g(), 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() = (2.77 +/- 0.42(stat) +/- 0.57(syst)) x 10(-3). (C) 1998 Elsevier Science B.V. All rights reserved.File in questo prodotto:
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