Measurement of the Multiplicity of Gluons Splitting to Bottom Quark Pairs in Hadronic Z$^0$ DecaysReport as inadecuate




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1 IPNL - Institut de Physique Nucléaire de Lyon 2 LAL - Laboratoire de l-Accélérateur Linéaire 3 PCC - Physique Corpusculaire et Cosmologie - Collège de France 4 IReS - Institut de Recherches Subatomiques 5 CPPM - Centre de Physique des Particules de Marseille 6 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

Abstract : An inclusive measurement of the average multiplicity of $b \bar b$ pairs from gluons, \gb, in hadronic $Z^0$ events collected by the DELPHI experiment at LEP, is presented. A counting technique, based on jet $b$-tagging in 4-jet events, has been used. Looking for secondary bottom production in events with production of any primary flavour, by requiring two $b$-tagged jets in well defined topological configurations, gave gb = 0.21 \pm 0.11stat \pm 0.09 syst \%. This result was checked with a different method designed to select events with four $b$ quarks in the final state. Agreement within the errors was found.





Author: P. Abreu W. Adam T. Adye I. Ajinenko G D. Alekseev R. Alemany P P. Allport S. Almehed S. Amato P. Andersson A. Andreazza P. Antil

Source: https://hal.archives-ouvertes.fr/



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