Skip to main content
SpringerLink
Log in

Production of onia in hadronic Z0 decays

  • Published:
Il Nuovo Cimento A (1971-1996)

Summary

Direct production mechanisms of heavy quarkonium states in hadronic Z0 decays are discussed. A search is described for direct production of J/ψ, ψ(2S) and γ in more than 3 million of the 1991–1994 DELPHI data. In the presence of a small excess (∼1% statistical probability) in the sum of candidate events relative to the estimated background, new upper limits are set in the range BR(Z0→(Q\(\bar Q\))X)/BR(Z0→hadrons)<0.87−8.7·10−4 (90% c.l.) for various strong production mechanisms of J/ψ and γ(1S, 2S, 3S).

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. Braaten E. et al., Phys. Rev. D,48 (1993) 4230; it agrees with an earlier computation ofBarger V. et al., Phys. Rev. D,41 (1990) 1541;Hagiwara K. et al., Phys. Lett. B,267 (1991) 527;316 (1993) 631 (Erratum);Braaten E. andYuan T. C.,Phys. Rev. D,50 (1994) 3176.

    Article  ADS  Google Scholar 

  2. Keung W. Y.,Phys. Rev. D,23 (1981) 2072.

    Article  ADS  Google Scholar 

  3. CDFCollaboration (T. Daniels et al.), J/ψ, ψ′→μ+μ− and B→J/ψ, ψ′cross-sections, DPF ’94 Conference, Albuquerque, USA, August 1994;Papadimitriou V., γproduction at CDF, DPF ’94 Conference, Albuquerque, USA, August 1994.

  4. L3Collaboration (O. Adriani et al.),Phys. Lett. B,288 (1992) 412.

    Article  ADS  Google Scholar 

  5. DELPHICollaboration (P. Abreu et al.),Phys. Lett. B,341 (1994) 109.

    Article  ADS  Google Scholar 

  6. DELPHICollaboration (P. Abreu et al.),Search for prompt production of heavy quarkonium states in hadronic Z0 decays, constribution to theEPS HEP 95 Conference, Brussels, August 1995.

  7. DELPHICollaboration (P. Aarnio et al.),Nucl. Instrum. Methods A,303 (1991) 233.

    Article  ADS  Google Scholar 

  8. Sjöstrand T.,Computer Phys. Commun.,39 (1986) 347;Sjöstrand T. andBengtsson M.,Computer Phys. Commun.,43 (1987) 367.

    Article  ADS  MathSciNet  Google Scholar 

  9. Contri R. andSimonetti S.,An external generator for four fermion processes, DELPHI Note, 91-24, PROG 162, May 1991.

  10. JADECollaboration (W. Bartl et al.),Z. Phys. C,33 (1986) 23.

    Article  Google Scholar 

  11. DELPHICollaboration (P. Abreu et al.),Z. Phys. C,65 (1995) 555.

    Article  Google Scholar 

  12. The Particle Data Group,Phys. Rev. D,50 (1994) 1173.

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

    Consortia

    DELPHI Collaboration

    Rights and permissions

    Reprints and permissions

    About this article

    Cite this article

    DELPHI Collaboration. Production of onia in hadronic Z0 decays. Nuov Cim A 109, 821–826 (1996). https://doi.org/10.1007/BF02731715

    Download citation

    • Received:

    • Published:

    • Issue Date:

    • DOI: https://doi.org/10.1007/BF02731715

    PACS

    PACS

    Search

    Navigation