Abstract
In e+e2212 collisions at centre-of-mass energies around 91 GeV, D*0 mesons have been reconstructed using data collected with the OPAL detector at LEP. The hadronisation fraction has been measured to be f(c→D*0)=0.218±0.054±0.045±0.007, where the errors correspond to the statistical and systematic errors specific to this analysis, and to systematic uncertainties from externally measured branching fractions, respectively. Together with previous OPAL measurements of the hadronisation fractions of other charmed mesons, this value is used to investigate the relative production of observed vector and pseudoscalar charmed mesons in \(Z^0 \to c\bar c\) decays. The production ratio is determined to be P Veff = V/(V+P)=0.57±0.05. The relative primary production of vector and pseudoscalar mesons, P rimv , is studied in the context of the production and decay of orbitally excited charmed resonances. The first measurement of the inclusive Ds*+ production rate in hadronic Z0 decays is presented.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
K. Cheung, Recent Progress on Perturbative QCD Fragmentation Functions, Proceedings of the 1995 PAS-COS/Hopkins Workshop, Baltimore, or hep-ph/9505365; E. Braaten, K. Cheung, S. Fleming, and T.C. Yuan, Phys. Rev. D51 (1995) 4819; Y.-Q. Chen, Phys. Rev. D48 (1993) 5181; M. Suzuki, Phys. Rev. D33 (1986) 676; R. Suaya, J.S. Townsend, Phys. Rev. D19 (1979) 1414.
OPAL Collaboration, K. Ackerstaff et al., Z. Phys. C74 (1997) 413; ALEPH Collaboration, D. Buskulic et al., Z. Phys. C69 (1996) 393; DELPHI Collaboration, P. Abreu et al., Z. Phys. C68 (1995) 353; L3 Collaboration, M. Acciarri et al., Phys. Lett. B345 (1995) 589.
M. Anselmino et al., Quark Fragmentation into Vector and Pseudoscalar Mesons at LEP, CERN-PPE/97-136, submitted to Phys. Lett. B.
ALEPH Collaboration, D. Buskulic et al., Z. Phys. C62 (1994) 1; DELPHI Collaboration, P. Abreu et al., Z. Phys. C59 (1993) 533, erratum-ibid. C65 (1995) 709.
F. Fiedler, Measurements of Hadronisation Aspects of Heavy Quark Production in Z0 Decays, to be published in the proceedings of the IVth International Workshop on Progress in Heavy Quark Physics, Rostock, Germany, September 20–22, 1997.
Yi-Jin Pei, Z. Phys. C72 (1996) 39.
L3 Collaboration, M. Acciarri et al., Phys. Lett. B396 (1997) 327.
OPAL Collaboration, G. Alexander et al., Z. Phys. C72 (1996) 1.
OPAL Collaboration, K. Ackerstaff et al., Eur. Phys. J. C1 (1998) 439
OPAL Collaboration, K. Ackerstaff et al., Z. Phys. C76 (1997) 425
OPAL Collaboration, P.P. Allport et al., Nucl. Instr. and Meth. A346 (1994) 476; OPAL Collaboration, P.P. Allport et al., Nucl. Instr. and Meth. A324 (1993) 34; O. Biebel et al., Nucl. Instr. and Meth. A323 (1992) 169; M. Hauschild et al., Nucl. Instr. and Meth. A314 (1992) 74; OPAL Collaboration, K. Ahmet et al., Nucl. Instr. and Meth. A305 (1991) 275.
OPAL Collaboration, G. Alexander et al., Z. Phys. C52 (1991) 175.
T. Sjöstrand, Comp. Phys. Comm. 82 (1994) 74.
OPAL Collaboration, G. Alexander et al., Z. Phys. C69 (1996) 543.
C. Peterson, D. Schlatter, I. Schmitt and P. M. Zerwas, Phys. Rev. D27 (1983) 105.
J. Allison et al., Nucl. Instr. and Meth. A317 (1992) 47.
M. Hauschild et al., Nucl. Instr. and Meth. A314 (1992) 74.
OPAL Collaboration, R. Akers et al., Z. Phys. C66 (1995), 19.
OPAL Collaboration, G. Alexander et al., Z. Phys. C73 (1997) 587.
Particle Data Group, Phys. Rev. D54 (1996) 1.
CLEO Collaboration, L. Gibbons et al., Phys. Rev. D 56 (1997) 3783
The LEP Collaborations ALEPH, DELPHI, L3, and OPAL, and the LEP Electroweak working group, Combining Heavy Flavour Electroweak Measurements at LEP, CERN-PPE/96-017 (1996).
OPAL Collaboration, K. Ackerstaff et al., Z. Phys. C74 (1997) 437.
The LEP Collaborations ALEPH, DELPHI, L3, and OPAL, the LEP Electroweak working group, and the SLD Heavy Flavour Group, A Combination of Preliminary Electroweak Measurements and Constraints on the Standard Model, CERN-PPE/96-183 (1996).
CLEO Collaboration, J. Gronberg et al., Phys. Rev. Lett. 75 (1995) 3232.
CLEO Collaboration, R. Balest et al., Phys. Rev. Lett. 72 (1994) 2328.
S. Godfrey and R. Kokoski, Phys. Rev. D43 (1991) 1679.
CLEO Collaboration, Y. Kubota et al., Phys. Rev. Lett. 72 (1994) 1972.
A. F. Falk and M. E. Peskin, Phys. Rev. D49 (1994) 3320.
F. Becattini, Universality of thermal hadron production in pp, pp and e+e− collisions, hep-ph/9701275, v2, to be published in the proceedings of the XXXIII Eloisatron Workshop on Universality features in multihadron production and the leading effect, October 19–25 1996, Erice, Italy.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ackerstaff, K., Alexander, G., Allison, J. et al. Determination of the production rate of D*0 mesons and of the ratio V/(V+P) in \(Z^0 \to c\bar c\) decays. Eur. Phys. J. C 5, 1–17 (1998). https://doi.org/10.1007/s100529800894
Received:
Issue Date:
DOI: https://doi.org/10.1007/s100529800894