Skip to main content
SpringerLink
Log in

Abnormal photonic energy — a signal of Quark matter possibly seen in exotic cosmic ray events

  • Nuclear Structure and Reactions
  • Published:
Zeitschrift für Physik A Atomic Nuclei

Abstract

A phenomenological method is proposed to select possible Quark matter forming events in ultra-relativistic nucleus-nucleus interactions. We compare the released photonic and hadronic energies from a Quark matter forming event and from a normal Hadronic event and derive a relation, which may be used in an event-by-event analysis to differentiate the two phases. We determine thus two regions of QCD deconfinement. We also discuss the hadronic, photonic energy and multiplicity contents and the 〈PT〉 of several exotic cosmic ray events at ultra high energies. On the basis of the phenomenological model, we suggest that the “Centauro” type are Quark matter events near the projectile fragmentation region with very large baryochemical potential,μ b. The “Anti-Centauro” type events are created by vacuum excitation in the central region with near zeroμ b.

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. Shuryak, E.V.: Phys. Lett.78B, 150 (1978)

    Google Scholar 

  2. Hwa, R.C., Kajantie, K.: Phys. Rev. D32, 1109 (1985)

    Google Scholar 

  3. Yoshida, R., et al.: Phys. Rev. D35, 388 (1987); For a more complete list of references see the Proceedings of the “Quark Matter '82–'86” Conferences

    Google Scholar 

  4. Sinha, B.: Phys. Lett.157B, 221 (1985)

    Google Scholar 

  5. Domokos, G.: Phys. Rev. D28, 123 (1983)

    Google Scholar 

  6. Kajantie, K., et al.: Phys. Rev. D34, 2746 (1986); For a more complete list of References see the Proceedings of the “Quark Matter '82–'86” Conferences

    Google Scholar 

  7. Cleymans, J., Finberg, J., Redlich, K.: Phys. Rev. D35, 2153 (1987)

    Google Scholar 

  8. Redlich, K.: Preprint BI-TP-08/1987

  9. Ito, A.S., et al.: Phys. Rev. D23, 604 (1981); WA-80 Coll.: Contribution to the “Quark Matter '87” Conference, Nordkirchen, August, 1987

    Google Scholar 

  10. The experimental FWHM of the ratio is approximately 15%

  11. Koch, P., Muller, B., Rafelski, J.: Phys. Rep.142, 167 (1987)

    Google Scholar 

  12. Danos, M., Rafelski, J.: Preprint UCT-TP-7/1984

  13. Rafelski, J., Schnabel, A.: Phys. Lett.207, 6 (1988)

    Google Scholar 

  14. In a large μb environment the critical temperature for deconfinement is considerably lower than that for μbŌ

  15. Cleymans, J., Dechantsreiter, M., Halzen, F.: Z. Phys. C — Particles and Fields17, 341 (1983)

    Google Scholar 

  16. Lattes, C.M.G., Fujimoto, Y., Hasegawa, S.: Phys. Rep.65, 151 (1980)

    Google Scholar 

  17. Gavai, R.V.: Preprint TIFR/TH/87-57

  18. Celik, T., Engels, J., Satz, H.: Nucl. Phys. B256, 670 (1985)

    Google Scholar 

  19. Kogut, J., et al.: Phys. Rev. Lett.53, 644 (1984)

    Google Scholar 

  20. Satz, H.: Preprint BNL#37953

  21. Anishetty, R., Koehler, P., McLerran, L.: Phys. Rev. D22, 2793 (1980)

    Google Scholar 

  22. Bjorken, J.D.: Phys. Rev. D27, 140 (1983)

    Google Scholar 

  23. Kajantie, K., Raitio, R., Ruuskanen, P.: Nucl. Phys. B222, 152 (1983)

    Google Scholar 

  24. Cheuk-Yin, Wong: Phys. Rev. Lett.52, 1393 (1984)

    Google Scholar 

  25. Yamashita, S., Ohsawa, A., Chinellato, J.A.: Proceedings of the International Symposium on Cosmic Rays & Particle Physics, p. 30, Tokyo 1984

  26. Pamir Coll. 20th International Cosmic Ray Conference, pp. 334, 351, 383, Moscow 1987

  27. Pamir Coll. 17th Int. Cosmic Ray Conference, p. 291, Paris 1981

  28. Panagiotou, A.D., Karabarbounis, A., Petridis, A.: Preprint UA-NPPS-8/1987

  29. Panagiotou, A.D.: Preprint UA-NPPS-5/1988

  30. Borisov, A.S., et al.: Phys. Lett.190B, 226 (1987)

    Google Scholar 

  31. JACEE Coll.: 20th International Cosmic Ray Conference, pp. 185, 194, 198, Moscow 1987

  32. JACEE Coll. International Conference on Physics and Astrophysics of Quark-Gluon Plasma, Bombay, February 8–12, 1988

  33. Yamashita, S., et al.: Proceedings of the International Symposium on Cosmic Rays & Particle Physics, p. 46, Tokyo 1984

  34. Bayburina, S.G., et al.: Nucl. Phys. B191, 1 (1981)

    Google Scholar 

  35. The ratios should be considered as lower limits, since the gamma content is in general overestimated

  36. Zhdanov, G.B.: Preprint FIAN-140/1980

  37. Feinberg, E.L.: Izu. Akad. Nauk. SSSR, Ser. Fiz.26, 622 (1962)

    Google Scholar 

  38. Halzen, F.: 17th International Cosmic Ray Conference, p. 392. Paris 1981

  39. Halzen, F., Scott, D.M.: Phys. Rev. D21, 1320 (1980)

    Google Scholar 

  40. Halzen, F., Liu, H.C.: Phys. Rev. D25, 1842 (1982)

    Google Scholar 

  41. NA35 Coll. Proceedings of the Sixth International Conference on Quark Matter '87, p. 89, Nordkirchen, FRD, 24–28 August, 1987

  42. NA5 Coll.: Private communication

  43. Alexopoulos, T., et al.: Phys. Rev. Lett.60, 1622 (1988)

    Google Scholar 

  44. UA1: Arnison, G., et al.: Phys. Lett. B118, 167 (1982); Phys. Lett. B167, 155(1983)

    Google Scholar 

  45. Van Hove, L.: Phys. Lett. B118, 138 (1982)

    Google Scholar 

  46. NA-35 Coll.: Bamberger, A., et al.: Phys. Lett. B184, 271 (1987)

    Google Scholar 

  47. UA5: Alner, G.J., et al.: Phys. Rep.154, 247 (1987)

    Google Scholar 

  48. UA5: Alner, G.J.: Phys. Lett. B180, 415 (1986)

    Google Scholar 

  49. Tomaszewski, A., Wlodarcsyk, Z.: Proceedings of the 17th ICCR, Vol. 5, p. 136, Paris 1981

    Google Scholar 

  50. The number of target participant nucleons in a central collision, as given by the “clean cut geometry” model, is: 〈A trg〉≃1.5A 2/3proj A 1/3trg . For an incident proton, 〈A trg〉≃1.1A 1/3trg

Download references

Author information

Authors and Affiliations

  1. CERN-EP Division, Geneva, Switzerland

    A. D. Panagiotou

  2. Physics Department, Nuclear & Particle Physics Division, University of Athens, Panepistimiopolis, Athens, Greece

    A. D. Panagiotou, A. Karabarbounis & A. Petridis

Authors
  1. A. D. Panagiotou
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. A. Karabarbounis
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. A. Petridis
    View author publications

    You can also search for this author in PubMed Google Scholar

Additional information

We acknowledge interesting and constructive discussions with Prof.'s R. Stock and N. Antoniou. Work supported in part by the Hellenic General Secretariat for Research and Technology.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Panagiotou, A.D., Karabarbounis, A. & Petridis, A. Abnormal photonic energy — a signal of Quark matter possibly seen in exotic cosmic ray events. Z. Physik A - Atomic Nuclei 333, 355–366 (1989). https://doi.org/10.1007/BF01299688

Download citation

  • Received:

  • Revised:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF01299688

PACS

Search

Navigation