The Delphi Collaboration (Including: Barker, Gary John). (2011) A study of the b-quark fragmentation function with the DELPHI detector at LEP I and an averaged distribution obtained at the Z Pole. The European Physical Journal C, Vol.71 (No.2). Article no.1557. doi:10.1140/epjc/s10052-011-1557-x

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Abstract

The nature of b-quark jet hadronisation has been investigated using data taken at the Z peak by the DELPHI detector at LEP. Two complementary methods are used to reconstruct the energy of weakly decaying b-hadrons, EBweak. The average value of xBweak=EBweakEbeam is measured to be 0.699±0.011. The resulting xBweak distribution is then analysed in the framework of two choices for the perturbative contribution (parton shower and Next to Leading Log QCD calculation) in order to extract measurements of the non-perturbative contribution to be used in studies of b-hadron production in other experimental environments than LEP. In the parton shower framework, data favour the Lund model ansatz and corresponding values of its parameters have been determined within PYTHIA 6.156 from DELPHI data:
a=184+023−021andb=0642+0073−0063 GeV−2
with a correlation factor ρ=92.2%.
Combining the data on the b-quark fragmentation distributions with those obtained at the Z peak by ALEPH, OPAL and SLD, the average value of xBweak is found to be 0.7092±0.0025 and the non-perturbative fragmentation component is extracted. Using the combined distribution, a better determination of the Lund parameters is also obtained:
a=148+011−010andb=0509+0024−0023 GeV−2
with a correlation factor ρ=92.6%.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Quarks, Nuclear track detectors, Electron-positron interactions, Weak interactions (Nuclear physics)
Journal or Publication Title:	The European Physical Journal C
Publisher:	Springer
ISSN:	1434-6044
Official Date:	February 2011
Dates:	Date Event February 2011 Published
Volume:	Vol.71
Number:	No.2
Page Range:	Article no.1557
DOI:	10.1140/epjc/s10052-011-1557-x
Status:	Peer Reviewed
Publication Status:	Published
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), Belgium. Services fédéraux des affaires scientifiques, techniques et culturelles (OSTC), Agentschap voor Innovatie door Wetenschap en Technologie (Belgium) (IWT), 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], European Commission (EC), 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], Science and Technology Facilities Council (Great Britain) (STFC), United States. Dept. of Energy, European Economic Community (EEC)
Grant number:	GZ 616.364/2-III/2a/98 (BMWF), LC527 (MSMT), AV0Z10100502 (ASCR), DG XII (EC), SPUB-M/CERN/PO3/DZ296/2000 (SRC), SPUB-M/CERN/PO3/DZ297/2000 (SRC), 2P03B10419 (SRC), 2P03B 69 23(2002-2004) (SRC), 95/5195/134 (VEGA), DE-FG02-01ER41155 (DoE), HPRN-CT-00292-2

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