Advertisement

The European Physical Journal A

, Volume 39, Issue 2, pp 169–177 | Cite as

Determination of the Dalitz plot parameter \( \alpha\) for the decay \( \eta\) → 3\( \pi^{0}_{}\) with the Crystal Ball at MAMI-B

  • Crystal Ball at MAMI, TAPS and A2 Collaborations
  • M. Unverzagt
  • P. Aguar-Bartolomé
  • J. Ahrens
  • J. R. M. Annand
  • H. J. Arends
  • R. Beck
  • V. Bekrenev
  • B. Boillat
  • A. Braghieri
  • D. Branford
  • W. J. Briscoe
  • J. W. Brudvik
  • S. Cherepnya
  • R. Codling
  • E. J. Downie
  • L. V. Fil’kov
  • D. I. Glazier
  • R. Gregor
  • E. Heid
  • D. Hornidge
  • O. Jahn
  • V. L. Kashevarov
  • R. Kondratiev
  • M. Korolija
  • M. Kotulla
  • D. Krambrich
  • B. Krusche
  • M. Lang
  • V. Lisin
  • K. Livingston
  • S. Lugert
  • I. J. D. MacGregor
  • D. M. Manley
  • M. Martinez-Fabregate
  • J. C. McGeorge
  • D. Mekterovic
  • V. Metag
  • B. M. K. Nefkens
  • A. Nikolaev
  • R. Novotny
  • R. O. Owens
  • P. Pedroni
  • A. Polonski
  • S. N. Prakhov
  • J. W. Price
  • G. Rosner
  • M. Rost
  • T. Rostomyan
  • S. Schumann
  • D. Sober
  • A. Starostin
  • I. Supek
  • C. M. Tarbert
  • A. Thomas
  • Th. Walcher
  • D. P. Watts
  • F. Zehr
Regular Article - Experimental Physics

Abstract

A precise measurement of the Dalitz plot parameter, \( \alpha\) , for the \( \eta\) → 3\( \pi^{0}_{}\) decay is presented. The experiment was performed with the Crystal Ball and TAPS large-acceptance photon detectors at the tagged photon beam facility of the MAMI-B electron accelerator in Mainz. High statistics of 1.8 · 106 \( \eta\) → 3\( \pi^{0}_{}\) events were obtained, giving the result \( \alpha\) = - 0.032±0.002stat±0.002syst .

PACS

25.20.Lj Photoproduction reactions 13.60.Le Meson production 14.40.Aq \( \pi\) , K and \( \eta\) mesons 13.25.Jx Decays of other mesons 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    D.G. Sutherland, Phys. Lett. 23, 384 (1966).Google Scholar
  2. 2.
    R. Baur, J. Kambor, D. Wyler, Nucl. Phys. B 460, 127 (1996).Google Scholar
  3. 3.
    C. Ditsche, B. Kubis, U.-G. Meißner, arXiv:0812.0344 [hep-ph], to be published in Eur. Phys. J. C.Google Scholar
  4. 4.
    H. Osborn, D.J. Wallace, Nucl. Phys. B 20, 23 (1970).Google Scholar
  5. 5.
    J. Gasser, H. Leutwyler, Nucl. Phys. B 250, 539 (1985).Google Scholar
  6. 6.
    J. Bijnens, K. Ghorbani, JHEP 0711, 030 (2007).Google Scholar
  7. 7.
    J. Kambor, C. Wiesendanger, D. Wyler, Nucl. Phys. B 465, 215 (1996).Google Scholar
  8. 8.
    A.V. Anisovich, H. Leutwyler, Phys. Lett. B 375, 335 (1996).Google Scholar
  9. 9.
    B. Borasoy, R. Nißler, Eur. Phys. J. A 26, 383 (2005).Google Scholar
  10. 10.
    Particle Data Group (C. Amsler), Phys. Lett. B 667, 1 (2008).Google Scholar
  11. 11.
    J. Bijnens, J. Gasser, Phys. Scr. T 99, 34 (2002).Google Scholar
  12. 12.
    N.N. Khuri, S.B. Treiman, Phys. Rev. 119, 1115 (1960).Google Scholar
  13. 13.
    Particle Data Group (S. Eidelman), Phys. Lett. B 592, 1 (2004).Google Scholar
  14. 14.
    W.B. Tippens, Phys. Rev. Lett. 87, 192001 (2001).Google Scholar
  15. 15.
    F. Ambrosino, arXiv:0707.4137 [hep-ex].Google Scholar
  16. 16.
    C. Baglin, Nucl. Phys. B 22, 66 (1970).Google Scholar
  17. 17.
    D. Alde, Z. Phys. C 25, 225 (1984).Google Scholar
  18. 18.
    A. Abele, Phys. Lett. B 417, 193 (1998).Google Scholar
  19. 19.
    M.N. Achasov, JETP Lett. 73, 451 (2001).Google Scholar
  20. 20.
    M. Bashkanov, Phys. Rev. C 76, 048201 (2007).Google Scholar
  21. 21.
    C. Adolph, arXiv:0811:2763 [nucl-ex].Google Scholar
  22. 22.
    T. Capussela, Acta Phys. Slov. 56, 341 (2005).Google Scholar
  23. 23.
    H. Herminghaus, IEEE Trans. Nucl. Sci. 30, 3274 (1983).Google Scholar
  24. 24.
    Th. Walcher, Prog. Part. Nucl. Phys. 24, 189 (1990).Google Scholar
  25. 25.
    M. Unverzagt, PhD Thesis, Rheinische Friedrich-Wilhelms-Uni\-versität Bonn, Germany, 2007.Google Scholar
  26. 26.
    I. Anthony, J.D. Kellie, S.J. Hall, G.J. Miller, J. Ahrens, Nucl. Instrum. Methods A 301, 230 (1991).Google Scholar
  27. 27.
    S.J. Hall, G.J. Miller, R. Beck, P. Jennewein, Nucl. Instrum. Methods A 368, 698 (1996).Google Scholar
  28. 28.
    M. Oreglia, Phys. Rev. D 25, 2259 (1982).Google Scholar
  29. 29.
    A. Starostin, Phys. Rev. C 64, 055205 (2001).Google Scholar
  30. 30.
    D. Watts, Calorimetry in Particle Physics: Proceedings of the 11th International Conference, Perugia, Italy, 2004, edited by C. Cecchi, P. Lubrano, M. Pepe (World Scientific, Singapore, 2005) p. 560.Google Scholar
  31. 31.
    R. Novotny, IEEE Trans. Nucl. Sci. 38, 379 (1991).Google Scholar
  32. 32.
    A.R. Gabler, Nucl. Instrum. Methods A 346, 168 (1994).Google Scholar
  33. 33.
    P. Avery, http://www.phys.ufl.edu/$\sim$avery/fitting. html.Google Scholar
  34. 34.
    B. Krusche, Phys. Rev. Lett. 75, 3023 (1995).Google Scholar
  35. 35.
    W.-T. Chiang, S.N. Yang, L. Tiator, M. Vanderhaegen, D. Drechsel, Phys. Rev. C 68, 045202 (2003).Google Scholar
  36. 36.
    D. Drechsel, O. Hanstein, S.S. Kamalov, L. Tiator, Nucl. Phys. A 645, 145 (1999).Google Scholar
  37. 37.
    D. Drechsel, S.S. Kamalov, L. Tiator, Eur. Phys. J. A 34, 69 (2007).Google Scholar
  38. 38.
    R.A. Arndt, Phys. Rev. C 53, 430 (1996).Google Scholar
  39. 39.
    J. Junkersfeld, PhD Thesis, Rheinische Friedrich-Wilhelms-Universität Bonn, Germany, 2005.Google Scholar
  40. 40.
    R. Nißler, PhD Thesis, Rheinische Friedrich-Wilhelms-Uni\-versität Bonn, Germany, 2007.Google Scholar
  41. 41.
    U.-G. Meißner, G. Müller, S. Steininger, Phys. Lett. B 406, 154 (1997)Google Scholar
  42. 42.
    U.-G. Meißner, Nucl. Phys. A 629, 72C (1998).Google Scholar
  43. 43.
    N. Cabibbo, Phys. Rev. Lett. 93, 121801 (2004).Google Scholar
  44. 44.
    N. Cabibbo, G. Isidori, JHEP 0503, 021 (2005).Google Scholar
  45. 45.
    J. Belina, Diploma Thesis, Universität Bern, Switzerland, 2006.Google Scholar
  46. 46.
    M. Bissegger, A. Fuhrer, J. Gasser, B. Kubis, A. Rusetsky, Phys. Lett. B 659, 576 (2008).Google Scholar
  47. 47.
    K.-H. Kaiser, Nucl. Instrum. Methods A 593, 159 (2008).Google Scholar
  48. 48.
    S. Prakhov, submitted to Phys. Rev. C (2008) [arXiv:0812.1999v2 [hep-ex]].Google Scholar

Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Crystal Ball at MAMI, TAPS and A2 Collaborations
  • M. Unverzagt
    • 1
    • 2
  • P. Aguar-Bartolomé
    • 1
  • J. Ahrens
    • 1
  • J. R. M. Annand
    • 3
  • H. J. Arends
    • 1
  • R. Beck
    • 1
    • 2
  • V. Bekrenev
    • 4
  • B. Boillat
    • 5
  • A. Braghieri
    • 6
  • D. Branford
    • 7
  • W. J. Briscoe
    • 8
  • J. W. Brudvik
    • 9
  • S. Cherepnya
    • 10
  • R. Codling
    • 3
  • E. J. Downie
    • 1
    • 3
  • L. V. Fil’kov
    • 10
  • D. I. Glazier
    • 7
  • R. Gregor
    • 11
  • E. Heid
    • 1
  • D. Hornidge
    • 12
  • O. Jahn
    • 1
  • V. L. Kashevarov
    • 10
  • R. Kondratiev
    • 13
  • M. Korolija
    • 14
  • M. Kotulla
    • 11
  • D. Krambrich
    • 1
  • B. Krusche
    • 5
  • M. Lang
    • 1
    • 2
  • V. Lisin
    • 13
  • K. Livingston
    • 3
  • S. Lugert
    • 11
  • I. J. D. MacGregor
    • 3
  • D. M. Manley
    • 15
  • M. Martinez-Fabregate
    • 1
  • J. C. McGeorge
    • 3
  • D. Mekterovic
    • 14
  • V. Metag
    • 11
  • B. M. K. Nefkens
    • 9
  • A. Nikolaev
    • 1
    • 2
  • R. Novotny
    • 11
  • R. O. Owens
    • 3
  • P. Pedroni
    • 6
  • A. Polonski
    • 13
  • S. N. Prakhov
    • 9
  • J. W. Price
    • 9
  • G. Rosner
    • 3
  • M. Rost
    • 1
  • T. Rostomyan
    • 6
  • S. Schumann
    • 1
    • 2
  • D. Sober
    • 16
  • A. Starostin
    • 9
  • I. Supek
    • 14
  • C. M. Tarbert
    • 7
  • A. Thomas
    • 1
  • Th. Walcher
    • 1
  • D. P. Watts
    • 7
  • F. Zehr
    • 5
  1. 1.Institut für KernphysikUniversity MainzMainzGermany
  2. 2.Helmholtz-Institut für Strahlen- und KernphysikUniversity BonnBonnGermany
  3. 3.Department of Physics and AstronomyUniversity of GlasgowGlasgowUK
  4. 4.Petersburg Nuclear Physics InstituteGatchinaRussia
  5. 5.Institut für PhysikUniversity BaselBaselSwitzerland
  6. 6.INFN Sezione di PaviaPaviaItaly
  7. 7.School of PhysicsUniversity of EdinburghEdinburghUK
  8. 8.Center for Nuclear StudiesThe George Washington UniversityWashingtonUSA
  9. 9.University of California at Los AngelesLos AngelesUSA
  10. 10.Lebedev Physical InstituteMoscowRussia
  11. 11.II. Physikalisches InstitutUniversity GießenGießenGermany
  12. 12.Mount Allison UniversitySackvilleCanada
  13. 13.Institute for Nuclear ResearchMoscowRussia
  14. 14.Rudjer Boskovic InstituteZagrebCroatia
  15. 15.Kent State UniversityKentUSA
  16. 16.The Catholic University of AmericaWashingtonUSA

Personalised recommendations