Advertisement

The European Physical Journal A

, Volume 32, Issue 2, pp 201–211 | Cite as

The radiative decay of the Λ(1405) and its two-pole structure

  • L. S. Geng
  • E. Oset
  • M. Döring
Regular Article - Hadron Physics

Abstract.

We evaluate theoretically the radiative decay widths into γΛ and γΣ 0 of the two poles of the Λ(1405) found in chiral unitary theories and we find quite different results for each of the two poles. We show that, depending on which reaction is used to measure the Λ(1405) radiative decays, one gives more weight to one or the other pole, resulting in quite different shapes in the γΛ(Σ 0) invariant-mass distributions. Our results for the high-energy pole agree with those of the empirical determination of the γΛ and γΣ 0 radiative widths (based on an isobar model fitting of the K-p atom data), which are sometimes referred to as “experimental data”. We have made a detailed study of the K - pπ 0 γΛ(Σ 0) and π - pK 0 γΛ(Σ 0) reactions and have shown that they, indeed, lead to different shapes for the γΛ(Σ 0) invariant-mass distributions.

PACS.

13.40.Hq Electromagnetic decays 14.20.Jn Hyperons 13.75.-n Hadron-induced low- and intermediate-energy reactions and scattering (energy ≤10GeV) 25.20.Lj Photoproduction reactions 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    N. Isgur, G. Karl, Phys. Rev. D 18, 4187 (1978).CrossRefADSGoogle Scholar
  2. 2.
    R.H. Dalitz, S.F. Tuan, Ann. Phys. (N.Y.) 10, 307 (1960).zbMATHCrossRefMathSciNetADSGoogle Scholar
  3. 3.
    N. Kaiser, T. Waas, W. Weise, Nucl. Phys. A 612, 297 (1997).CrossRefADSGoogle Scholar
  4. 4.
    E. Oset, A. Ramos, Nucl. Phys. A 635, 99 (1998).CrossRefADSGoogle Scholar
  5. 5.
    E. Oset, A. Ramos, C. Bennhold, Phys. Lett. B 527, 99 (2002)CrossRefADSGoogle Scholar
  6. 6.
    J.A. Oller, U.G. Meissner, Phys. Lett. B 500, 263 (2001).CrossRefADSGoogle Scholar
  7. 7.
    D. Jido, J.A. Oller, E. Oset, A. Ramos, U.G. Meissner, Nucl. Phys. A 725, 181 (2003).CrossRefADSGoogle Scholar
  8. 8.
    C. Garcia-Recio, J. Nieves, E. Ruiz Arriola, M.J. Vicente Vacas, Phys. Rev. D 67, 076009 (2003).CrossRefADSGoogle Scholar
  9. 9.
    C. Garcia-Recio, M.F.M. Lutz, J. Nieves, Phys. Lett. B 582, 49 (2004).CrossRefADSGoogle Scholar
  10. 10.
    T. Hyodo, S.I. Nam, D. Jido, A. Hosaka, Phys. Rev. C 68, 018201 (2003).CrossRefADSGoogle Scholar
  11. 11.
    B. Borasoy, R. Nissler, W. Weise, Eur. Phys. J. A 25, 79 (2005).CrossRefADSGoogle Scholar
  12. 12.
    J.A. Oller, J. Prades, M. Verbeni, Phys. Rev. Lett. 95, 172502 (2005).CrossRefADSGoogle Scholar
  13. 13.
    J.A. Oller, Eur. Phys. J. A 28, 63 (2006).CrossRefADSGoogle Scholar
  14. 14.
    B. Borasoy, U.G. Meissner, R. Nissler, Phys. Rev. C 74, 055201 (2006).CrossRefADSGoogle Scholar
  15. 15.
    J.C. Nacher, E. Oset, H. Toki, A. Ramos, Phys. Lett. B 455, 55 (1999).CrossRefADSGoogle Scholar
  16. 16.
    J.C. Nacher, E. Oset, H. Toki, A. Ramos, Phys. Lett. B 461, 299 (1999).CrossRefGoogle Scholar
  17. 17.
    T. Hyodo, A. Hosaka, E. Oset, A. Ramos, M.J. Vicente Vacas, Phys. Rev. C 68, 065203 (2003).CrossRefADSGoogle Scholar
  18. 18.
    Crystall Ball Collaboration (S. Prakhov), Phys. Rev. C 70, 034605 (2004).CrossRefADSGoogle Scholar
  19. 19.
    V.K. Magas, E. Oset, A. Ramos, Phys. Rev. Lett. 95, 052301 (2005).CrossRefADSGoogle Scholar
  20. 20.
    CLAS Collaboration (S. Taylor), Phys. Rev. C 71, 054609 (2005)CrossRefADSGoogle Scholar
  21. 21.
    F. Myhrer, Phys. Rev. C 74, 065202 (2006).CrossRefADSGoogle Scholar
  22. 22.
    D.A. Whitehouse, Phys. Rev. Lett. 63, 1352 (1989).CrossRefADSGoogle Scholar
  23. 23.
    H. Burkhardt, J. Lowe, Phys. Rev. C 44, 607 (1991).CrossRefADSGoogle Scholar
  24. 24.
    T.S.H. Lee, J.A. Oller, E. Oset, A. Ramos, Nucl. Phys. A 643, 402 (1998).CrossRefADSGoogle Scholar
  25. 25.
    B. Borasoy, P.C. Bruns, U.G. Meissner, R. Nissler, Phys. Rev. C 72, 065201 (2005).CrossRefADSGoogle Scholar
  26. 26.
    M. Döring, E. Oset, S. Sarkar, Phys. Rev. C 74, 065204 (2006).CrossRefGoogle Scholar
  27. 27.
    M. Doring, E. Oset, D. Strottman, Phys. Rev. C 73, 045209 (2006).CrossRefADSGoogle Scholar
  28. 28.
    D.A. Whitehouse, PhD Thesis, Boston University, 1988.Google Scholar
  29. 29.
    M. Döring, Nucl. Phys. A 786, 164 (2007).CrossRefGoogle Scholar
  30. 30.
    F.E. Close, N. Isgur, S. Kumano, Nucl. Phys. B 389, 513 (1993).CrossRefADSGoogle Scholar
  31. 31.
    J.A. Oller, Phys. Lett. B 426, 7 (1998).CrossRefADSGoogle Scholar
  32. 32.
    E. Marco, S. Hirenzaki, E. Oset, H. Toki, Phys. Lett. B 470, 20 (1999).CrossRefGoogle Scholar
  33. 33.
    L. Roca, A. Hosaka, E. Oset, arXiv:hep-ph/0611075.Google Scholar
  34. 34.
    M.E. Peskin, D.V. Schroeder, An Introduction To Quantum Field Theory (Perseus Books, 1995).Google Scholar
  35. 35.
    L. Yu, X.L. Chen, W.Z. Deng, S.L. Zhu, Phys. Rev. D 73, 114001 (2006).CrossRefADSGoogle Scholar
  36. 36.
    T. Van Cauteren, J. Ryckebusch, B. Metsch, H.R. Petry, Eur. Phys. J. A 26, 339 (2005).CrossRefGoogle Scholar
  37. 37.
    J.W. Darewych, M. Horbatsch, R. Koniuk, Phys. Rev. D 28, 1125 (1983).CrossRefADSGoogle Scholar
  38. 38.
    E. Kaxiras, E.J. Moniz, M. Soyeur, Phys. Rev. D 32, 695 (1985).CrossRefADSGoogle Scholar
  39. 39.
    M. Warns, W. Pfeil, H. Rollnik, Phys. Lett. B 258, 431 (1991).CrossRefADSGoogle Scholar
  40. 40.
    Y. Umino, F. Myhrer, Nucl. Phys. A 554, 593 (1993). CrossRefADSGoogle Scholar
  41. 41.
    C.L. Schat, N.N. Scoccola, C. Gobbi, Nucl. Phys. A 585, 627 (1995).CrossRefADSGoogle Scholar
  42. 42.
    R. Bijker, F. Iachello, A. Leviatan, Ann. Phys. (N.Y.) 284, 89 (2000).CrossRefADSGoogle Scholar
  43. 43.
    L.S. Geng, E. Oset, L. Roca, J.A. Oller, Phys. Rev. D 75, 014017 (2007).CrossRefADSGoogle Scholar

Copyright information

© Società Italiana di Fisica and Springer-Verlag 2007

Authors and Affiliations

  • L. S. Geng
    • 1
  • E. Oset
    • 1
  • M. Döring
    • 1
  1. 1.Departamento de Fısica Teórica and IFIC, Centro Mixto, Institutos de Investigación de PaternaUniversidad de Valencia-CSICValenciaSpain

Personalised recommendations