Skip to main content
Log in

First measurement of the quark-to-photon fragmentation function

  • Published:
Zeitschrift für Physik C Particles and Fields

Abstract

Earlier measurements at LEP of isolated hard photons in hadronic Z decays, attributed to radiation from primary quark pairs, have been extended in the ALEPH experiment to include hard photon productioninside hadron jets. Events are selected where all particles combine democratically to form hadron jets, one of which contains a photon with a fractional energyz≥0.7. After statistical subtraction of non-prompt photons, the quark-to-photon fragmentation function,D(z), is extracted directly from the measured 2-jet rate. By taking into account the perturbative contributions toD(z) obtained from anO(ααs) QCD calculation, the unknown non-perturbative component ofD(z) is then determined at highz. Provided due account is taken of hadronization effects nearz=1, a good description of the other event topologies is then found.

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

Access this article

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

Instant access to the full article PDF.

Similar content being viewed by others

References

  1. P.D. Acton et al., OPAL Collaboration, Z. Phys. C58 (1993) 405,

    ADS  Google Scholar 

  2. D. Buskulic et al., ALEPH Collaboration, Z. Phys. C57 (1993) 17,

    ADS  Google Scholar 

  3. P. Abreu et al., DELPHI Collaboration, CERN-PPE/95-101,

  4. O. Adriani et al., L3 Collaboration, Phys. Lett. B292 (1992) 472.

    Article  ADS  Google Scholar 

  5. E.W.N. Glover and W.J. Stirling, Phys. Lett. B295 (1992) 128.

    Article  ADS  Google Scholar 

  6. G. Kramer and H. Spiesberger, “Matrix element calculation of quark bremsstrahlung inO (ααs)”, DESY 92-022 (1992), contribution to the Workshop on Photon Radiation from Quarks, Annecy, France, 1991.

    Google Scholar 

  7. T. Sjostrand and M. Bengtson, Comput. Phys. Comm. 43 (1987) 367.

    Article  ADS  Google Scholar 

  8. G. Marchesini et al., Comput. Phys. Comm. 67 (1992) 465.

    Article  ADS  Google Scholar 

  9. L. Lonnblad, Comput. Phys. Comm. 71 (1992) 15.

    Article  ADS  Google Scholar 

  10. P. Mättig, H. Spiesberger and W. Zeuner, Z. Phys. C60 (1993) 613.

    ADS  Google Scholar 

  11. C. H. Llewellyn-Smith, Phys. Lett. B79 (1978) 83.

    Article  Google Scholar 

  12. Z. Kunzst and Z. Trocsanyi, Nucl. Phys. B394 (1993) 139.

    ADS  Google Scholar 

  13. Y. Dokshitzer, Contribution to the Workshop on Jets at LEP and HERA, J. Phys. G17 (1991) 1441.

    ADS  Google Scholar 

  14. D.W. Duke and J.F. Owens, Phys. Rev. D26 (1982) 1600.

    ADS  Google Scholar 

  15. E.W.N. Glover and A.G. Morgan, Z. Phys C62 (1994) 311.

    ADS  Google Scholar 

  16. D. Decamp et al., ALEPH Collaboration, Nucl. Instrum. Methods A294 (1990) 121.

    Article  ADS  Google Scholar 

  17. D. Decamp et al., ALEPH Collaboration, Z. Phys. C53 (1992) 1.

    ADS  Google Scholar 

  18. D. Buskulic et al., ALEPH Collaboration, Nucl. Instrum. Methods A360 (1995) 481.

    Article  ADS  Google Scholar 

  19. D. Buskulic et al., ALEPH Collaboration, Z. Phys. C55 (1992) 209.

    ADS  Google Scholar 

  20. D. Buskulic et al., ALEPH Collaboration, Z. Phys. C66 (1995) 355.

    ADS  Google Scholar 

  21. S. Jadach, B. Ward and Z. Was, Comput. Phys. Comm. 66 (1991) 276.

    Article  ADS  MATH  Google Scholar 

  22. The LEP Collaborations and the LEP Electroweak Working Group, CERN-PPE/93-157.

  23. F. Abe et al., CDF Collaboration, Phys. Rev. D48 (1993) 2998.

    ADS  Google Scholar 

  24. H. Baer, J. Ohnemus and J.F. Owens, Phys. Rev. D42 (1990) 61.

    ADS  Google Scholar 

  25. N. Glover, private communication.

Download references

Author information

Authors and Affiliations

Authors

Consortia

Additional information

Deceased.

Supported by CICYT, Spain.

Supported by the National Science Foundation of China.

Supported by the Danish Natural Science Research Council.

Supported by the UK Particle Physics and Astronomy Research Council.

Supported by the US Department of Energy, contract DE-AC02-76ER00881.

Supported by the US Department of Energy, contract DE-FG05-92ER40742.

Supported by the US Department of Energy, contract DE-FC05-85ER250000.

Supported by the Bundesministerium für Forschung und Technologie, Germany.

Supported by the Direction des Sciences de la Matière, C.E.A.

Supported by Fonds zur Förderung der wissenschaftlichen Forschung, Austria.

Supported by the US Department of Energy, grant DE-FG03-92ER40689.

Partially supported by Colciencias, Colombia.

Supported by the Commission of the European Communities, contract ERBCHBICT941234.

This article was processed by the author using the LATEX style filepljour2 from Springer-Verlag.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

ALEPH Collaboration., Buskulic, D., Casper, D. et al. First measurement of the quark-to-photon fragmentation function. Z. Phys. C - Particles and Fields 69, 365–377 (1995). https://doi.org/10.1007/BF02907417

Download citation

  • Received:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF02907417

Keywords

Navigation