298 articles – 2321 Notices  [english version]
 HAL : in2p3-00007832, version 1
 arXiv : hep-ex/0008013
 European Physical Journal C 18 (2000) 1-13
 A Measurement of the b-quark Mass from Hadronic Z Decays
 ALEPH Collaboration(s)
 (2000)
 Hadronic Z decay data taken with the ALEPH detector at LEP1 are used to measure the three-jet rate as well as moments of various event-shape variables. The ratios of the observables obtained from b-tagged events and from an inclusive sample are determined. The mass of the $b$ quark is extracted from a fit to the measured ratios using a next-to-leading order prediction including mass effects. Taking the first moment of the y_3 distribution, which is the observable with the smallest hadronization corrections and systematic uncertainties, the result is m_b(M_Z) = [3.27 +- 0.22(stat) +- 0.22(exp) +- 0.38(had) +- 0.16(theo)] GeV/c2. The measured ratio is alternatively employed to test the flavour independence of the strong coupling constant for b and light quarks.
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
 Lien vers le texte intégral : http://fr.arXiv.org/abs/hep-ex/0008013
 in2p3-00007832, version 1 http://hal.in2p3.fr/in2p3-00007832 oai:hal.in2p3.fr:in2p3-00007832 Contributeur : Magali Damoiseaux <> Soumis le : Lundi 19 Mars 2001, 12:57:58 Dernière modification le : Mardi 4 Juillet 2006, 16:00:48