Production rates of \mathrmbb quark pairs from gluons and \mathrmbbbb events in hadronic Z⁰ decays

2000/10/13 by The OPAL collaboration, G. Abbiendi et al., G. Abbiendi · 1 citation
Physics and Astronomy · #Particle Detector Development and Performance #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.1007/s100520100580

published as Eur.Phys.J.C18:447-460,2001 · 22 pages, 9 figures, submitted to Eur. Phys. J. C

arxiv created 2000/10/13 · openalex publication_date 2001/01/01 · arxiv updated 2009/11/30 · openalex created_date 2017/05/26 · openalex updated_date 2026/08/04

Abstract

The rates are measured per hadronic Z decay for gluon splitting to bb(bar) quark pairs, g_bb, and of events containing two bb(bar) quark pairs, g₄b, using a sample of four-jet events selected from data collected with the OPAL detector. Events with an enhanced signal of gluon splitting to bb(bar) quarks are selected if two of the jets are close in phase-space and contain detached secondary vertices. For the event sample containing two bb(bar) quark pairs, three of the four jets are required to have a significantly detached secondary vertex. Information from the event topology is combined in a likelihood fit to extract the values of g_bb and g₄b, namely g_bb = (3.07 +- 0.53(stat) +- 0.97(syst))x10^-3 g₄b = (0.36 +- 0.17(stat) +- 0.27(syst))x10^-3

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