CERN Accelerating science

Article
Title	Study of hard gluon radiation in b final states and a determination of $M_{B}$ at $M_{Z}$
Author(s)	Costa, M J ; Fuster, J A ; Tortosa, P ; Bambade, P
Affiliation	(Valencia Univ, Spain)
Publication	2003
In:	32nd International Symposium on Multiparticle Dynamics, Alushta, Ukraine, 7 - 13 Sep 2002, pp.315-20
Subject category	Particle Physics - Phenomenology
Abstract	The effects in the emission of gluons due to the mass of the heavy quarks have clearly been observed by the experiments at LEP and SLC. The analyses of the data using theoretical corrections computed at next-to-leading order have allowed to either test the flavour independence of the strong coupling constant with very high precision ( 1%) or measure the b-quark mass at high energy, square root s M/sub Z/. The results obtained by the various experiments, ALEPH, DELPHI, OPAL and SLD, agree well within errors and confirm the energy evolution of the b-quark running mass as predicted by QCD. The systematic uncertainties limit present determinations though a new study performed by DELPHI allows to reduce the present bounds to  330 MeV total uncertainty. (14 refs).