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, \(E_{\mathrm{B}}^{\mathrm{weak}}\). The average value of \(x^{\mathrm{weak}}_{\mathrm{B}} = E_{\mathrm{B}}^{\mathrm{weak}}/E_{\mathrm{beam}}\) is measured to be 0.699±0.011. The resulting \(x^{\mathrm{weak}}_{\mathrm{B}}\) 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:
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 \(x^{\mathrm{weak}}_{\mathrm{B}}\) 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:
with a correlation factor ρ=92.6%.
Article PDF
Similar content being viewed by others
Explore related subjects
Discover the latest articles, news and stories from top researchers in related subjects.Avoid common mistakes on your manuscript.
References
X. Artru, G. Mennessier, Nucl. Phys. B 70, 93 (1974)
R.D. Field, R.P. Feynman, Nucl. Phys. B 136, 1 (1978)
B. Andersson, G. Gustafson, C. Peterson, Z. Phys. C 1, 105 (1979)
G. Marchesini, B.R. Webber, Nucl. Phys. B 238, 1 (1984)
B. Andersson, G. Gustafson, G. Ingelman, T. Sjöstrand, Phys. Rep. 97, 31 (1983)
C. Amsler et al. (Particle Data Group), Phys. Lett. B 667, 1 (2008)
R. Barate et al. (ALEPH Collaboration), Phys. Lett. B 425, 215 (1998)
T. Affolder et al. (CDF Collaboration), Phys. Rev. D 64, 072002 (2001)
P. Abreu et al. (DELPHI Collaboration), Z. Phys. C 68, 353 (1995)
D. Buskulic et al. (ALEPH Collaboration), Z. Phys. C 69, 393 (1996)
K. Akerstaff et al. (OPAL Collaboration), Z. Phys. C 74, 413 (1997)
P. Aarnio et al. (DELPHI Collaboration), Nucl. Instrum. Methods A 303, 233 (1991)
P. Abreu et al. (DELPHI Collaboration), Nucl. Instrum. Methods A 378, 57 (1996)
J. Abdallah et al. (DELPHI Collaboration), Eur. Phys. J. C 32, 185 (2004)
T. Sjöstrand, Comput. Phys. Commun. 39, 347 (1986)
T. Sjöstrand, M. Bengtsson, Comput. Phys. Commun. 43, 367 (1987)
P. Abreu et al. (DELPHI Collaboration), Z. Phys. C 73, 11 (1996)
C. Peterson, D. Schlatter, I. Schmitt, P.M. Zerwas, Phys. Rev. D 27, 105 (1983)
M. Feindt, U. Kerzel, Nucl. Instrum. Methods A 559, 190 (2006)
V. Blobel, OPAL Technical Note TN361, March 8, 1996. http://www.desy.de/~blobel/opalnote.ps
V. Blobel, in Proceedings of the 1984 CERN School of Computing, CERN 85-09 (1985), pp. 88–127. http://cdsweb.cern.ch/record/161223/files/full_document.pdf?version=1
T. Boccali, Nucl. Phys. Proc. Suppl. 75B(3), 241 (1999) and references therein
J. Abdallah et al. (DELPHI Collaboration), Eur. Phys. J. C 33, 307 (2004)
Z. Albrecht et al., A study of excited b-hadron states with the DELPHI detector at LEP1, Contributed Paper for ICHEP 2004 (Beijing), DELPHI 2004-025 CONF 700. http://delphiwww.cern.ch/pubxx/delnote/public/2004_025_conf_700.ps.gz
T. Sjöstrand, Comput. Phys. Commun. 82, 74 (1994)
P. Abreu et al. (DELPHI Collaboration), Phys. Lett. B 462, 425 (1999)
A. Heister et al. (ALEPH Collaboration), Phys. Lett. B 512, 30 (2001)
G. Abbiendi et al. (OPAL Collaboration), Eur. Phys. J. C 29, 463 (2003)
K. Abe et al. (SLD Collaboration), Phys. Rev. D 65, 092006 (2002). Erratum-ibid. 66, 079905 (2002)
B. Andersson, G. Gustafson, B. Soderberg, Z. Phys. C 20, 317 (1983)
M.G. Bowler, Z. Phys. C 11, 169 (1981)
E. Ben-Haim, FERMILAB-THESIS-2004-50. http://publication.lal.in2p3.fr/2004/lal04124.pdf
E. Ben-Haim, P. Bambade, P. Roudeau, A. Savoy-Navarro, A. Stocchi, Phys. Lett. B 580, 108 (2004)
M. Cacciari, S. Catani, Nucl. Phys. B 617, 253 (2001)
V.G. Kartvelishvili, A.K. Likehoded, V.A. Petrov, Phys. Lett. B 78, 615 (1978)
P. Collins, T. Spiller, J. Phys. G 11, 1289 (1985)
Z. Albrecht, T. Allmendinger, G.J. Barker, M. Feindt, C. Haag, M. Moch, hep-ex/0102001
Author information
Authors and Affiliations
Consortia
Corresponding author
Rights and permissions
Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
About this article
Cite this article
The DELPHI Collaboration., Abdallah, J., Abreu, P. et al. A study of the b-quark fragmentation function with the DELPHI detector at LEP I and an averaged distribution obtained at the Z Pole. Eur. Phys. J. C 71, 1557 (2011). https://doi.org/10.1140/epjc/s10052-011-1557-x
Received:
Revised:
Published:
DOI: https://doi.org/10.1140/epjc/s10052-011-1557-x