DELPHI Collaboration (Including: Barker, Gary John). (2008) Study of b-quark mass effects in multijet topologies with the DELPHI detector at LEP. The European Physical Journal C, Vol.55 (No.4). doi:10.1140/epjc/s10052-008-0631-5

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Abstract

The effect of the heavy b-quark mass on the two, three and four-jet rates is studied using LEP data collected by the DELPHI experiment at the Z peak in 1994 and 1995. The rates of b-quark jets and light quark jets (l=uds) in events with n=2, 3, and 4 jets, together with the ratio of two and four-jet rates of b-quarks with respect to light-quarks, Rn bl, have been measured with a double-tag technique using the CAMBRIDGE jet-clustering algorithm. A comparison between experimental results and theory (matrix element or Monte Carlo event generators such as PYTHIA, HERWIG and ARIADNE) is done after the hadronisation phase. Using the four-jet observable R4 bl, a measurement of the b-quark mass using massive leading-order calculations gives: This result is compatible with previous three-jet determinations at the MZ energy scale and with low energy mass measurements evolved to the MZ scale using QCD renormalisation group equations.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Electron-positron interactions, Quarks, Jets (Nuclear physics)
Journal or Publication Title:	The European Physical Journal C
Publisher:	Springer
ISSN:	1434-6044
Official Date:	June 2008
Dates:	Date Event June 2008 Published
Volume:	Vol.55
Number:	No.4
DOI:	10.1140/epjc/s10052-008-0631-5
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Austria. Bundesministerium für Wissenschaft und Forschung [Federal Ministry of Education, Science and Culture], Fonds national de la recherche scientifique (Belgium) (FNRS), Fonds Wetenschappelijk Onderzoek (FWO), Agentschap voor Innovatie door Wetenschap en Technologie (Belgium) (IWT), Belgium. Services fédéraux des affaires scientifiques, techniques et culturelles (OSTC), Financiadora de Estudos e Projetos (Brazil) (FINEP), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Brazil. Coordenação do Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Fundação Universitária José Bonifácio (FUJB), Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ), Czech Republic. Ministerstvo školství, mládeže a tělovýchovy [Ministry of Education, Youth, and Sport], Akademie věd České republiky [Academy of Sciences of the Czech Republic], Commission of the European Communities, Direction des Sciences de la Matière, France. Commissariat à l'énergie atomique (CEA), Germany. Bundesministerium für Bildung und Forschung (BMBF), Greece. General Secretariat of Research and Technology, Nederlandse Organisatie voor Wetenschappelijk Onderzoek [Netherlands Organisation for Scientific Research] (NWO), Stichting voor Fundamenteel Onderzoek der Materie (FOM) [Foundation for Fundamental Research on Matter], Norges forskningsråd [Norwegian Research Council], Scientific Research Committee (Poland), Fundação para a Ciência e a Tecnologia (FCT), Slovakia. Vedecka grantova agentura MS SR, Slovenia. Ministrstvo za znanost in tehnologijo [Ministry of Science and Technology], Spain. Comisión Interministerial de Ciencia y Tecnología (CICYT), Sweden. Vetenskapsrådet [Research Council], Particle Physics and Astronomy Research Council (Great Britain) (PPARC), United States. Dept. of Energy, European Economic Community (EEC)

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