Author/Authors :
DELPHI Collaboration، نويسنده , , P Abreu، نويسنده , , W Adam، نويسنده , , T Adye، نويسنده , , P Adzic، نويسنده , , I Ajinenko، نويسنده , , G.D. Alekseev، نويسنده , , R Alemany، نويسنده , , P.P. Allport، نويسنده , , S. Almehed، نويسنده , , U Amaldi، نويسنده , , S Amato، نويسنده , , P Andersson، نويسنده , , A Andreazza، نويسنده , , P. Antilogus، نويسنده , , W-D Apel، نويسنده , , Y Arnoud، نويسنده , , B ?sman، نويسنده , , J-E Augustin، نويسنده , , A Augustinus، نويسنده , , et al.، نويسنده ,
Abstract :
The value of the b quark mass at the MZ scale defined in the MS renormalization scheme, mb(MZ), was determined using 2.8 million hadronic Z decays collected during 1992-1994 by the DELPHI detector to bemb(MZ)=2.67±0.25 (stat.)±0.34 (frag.)±0.27 (theo.) GeV/c2.The analysis considers NLO corrections to the three-jet production rate including mass effects, and the result obtained agrees with the QCD prediction of having a running b quark mass at an energy scale equal to MZ. This is the first time that such a measurement is performed far above the bb production threshold. The study also verifies the flavour independence of the strong coupling constant for b and light quarks within 1% accuracy.
