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DELPHI Collaboration; Abdallah, J. (2011)
Publisher: Springer
Languages: English
Types: Article
Subjects: :Mathematics and natural science: 400::Physics: 430::Nuclear and elementary particle physics: 431 [VDP], QC, Settore FIS/01 - Fisica Sperimentale, Engineering (miscellaneous), High Energy Physics - Experiment, lund Monte-Carlo; jet fragmentation; heavy quarks; Z-decays; string model; E+E-physics; B(B)over-bar; extraction, Physics and Astronomy (miscellaneous)
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, EBweakEBweak . The average value of xweakB = EBweak/EbeamxBweak=EBweakEbeam is measured to be 0.699±0.011. The resulting xweakBxBweak 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 = 1.84+0.23-0.21 and b=0.642+0.073-0.063 GeV-2,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 xweakBxBweak 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 = 1.48+0.11-0.10 and b=0.509+0.024-0.023 GeV-2,a=148+011−010andb=0509+0024−0023 GeV−2 with a correlation factor ρ=92.6%.
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