Advertisement

The European Physical Journal A

, Volume 43, Issue 3, pp 269–282 | Cite as

Radiative π0 photoproduction on protons in the Δ+ (1232) region

  • The Crystal Ball at MAMI, TAPS and A2 Collaborations
  • S. SchumannEmail author
  • B. Boillat
  • E. J. Downie
  • P. Aguar-Bartolomé
  • J. Ahrens
  • J. R. M. Annand
  • H. J. Arends
  • R. Beck
  • V. Bekrenev
  • A. Braghieri
  • D. Branford
  • W. J. Briscoe
  • J. W. Brudvik
  • S. Cherepnya
  • R. Codling
  • P. Drexler
  • 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
  • M. Ostrick
  • R. O. Owens
  • P. Pedroni
  • A. Polonski
  • S. N. Prakhov
  • J. W. Price
  • G. Rosner
  • M. Rost
  • T. Rostomyan
  • D. Sober
  • A. Starostin
  • I. Supek
  • C. M. Tarbert
  • A. Thomas
  • M. Unverzagt
  • Th. Walcher
  • D. P. Watts
  • F. Zehr
Regular Article - Experimental Physics

Abstract

The reaction γp 0γ′ has been measured with the Crystal Ball/TAPS detectors using the energy-tagged photon beam at the electron accelerator facility MAMI-B. Energy and angular differential cross-sections for the emitted photon γ′ and angular differential cross-sections for the π0 have been determined with high statistics in the energy range of the Δ+ (1232)-resonance. Cross-sections and the ratio of the cross-section to the nonradiative process γp 0 are compared to theoretical reaction models, having the anomalous magnetic moment κ Δ as free parameter. As the shape of the experimental distributions is not reproduced in detail by the model calculations, currently no extraction of κ Δ is feasible.

Keywords

Beam Energy Anomalous Magnetic Moment Magnetic Dipole Moment Background Contribution Pion Photoproduction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    F. Schlumpf, Phys. Rev. D 48, 4478 (1993)CrossRefADSGoogle Scholar
  2. 2.
    G.S Yang, H.C. Kim, M. Praszalowicz, K. Goeke, Phys. Rev. D 70, 114002 (2004)CrossRefADSGoogle Scholar
  3. 3.
    S.T. Hong, D.P. Min, arXiv:nucl-th/9909004
  4. 4.
    D.B. Leinweber, T. Draper, R.M. Woloshyn, Phys. Rev. D 46, 3067 (1992)CrossRefADSGoogle Scholar
  5. 5.
    I.C. Cloet, D.B. Leinweber, A.W. Thomas, Phys. Lett. B 563, 157 (2003)CrossRefADSGoogle Scholar
  6. 6.
    R. Beck et al., Phys. Rev. Lett. 78, 606 (1997)CrossRefADSGoogle Scholar
  7. 7.
    S.S. Kamalov, S.N. Yang, D. Drechsel, O. Hanstein, L. Tiator, Phys. Rev. C 64, 032201 (2001)CrossRefADSGoogle Scholar
  8. 8.
    L.A. Kondratyuk, L.A. Ponomarov, Yad. Fiz. 7, 11 (1968) (Sov. J. Nucl. Phys. 7Google Scholar
  9. 9.
    D. Drechsel, M. Vanderhaeghen, Phys. Rev. C 64, 065202 (2001)CrossRefADSGoogle Scholar
  10. 10.
    M. Arman et al., Phys. Rev. Lett. 29, 962 (1972)CrossRefADSGoogle Scholar
  11. 11.
    B.M.K. Nefkens et al., Phys. Rev. D 18, 3911 (1978)CrossRefADSGoogle Scholar
  12. 12.
    C.A. Meyer et al., Phys. Rev. D 38, 754 (1988)CrossRefADSGoogle Scholar
  13. 13.
    A. Bosshard et al., Phys. Rev. D 44, 930 (1991)CrossRefGoogle Scholar
  14. 14.
    L. Heller, S. Kumano, J.C. Martinez, E.J. Moniz, Phys. Rev. C 35, 718 (1987)CrossRefADSGoogle Scholar
  15. 15.
    R. Wittman, Phys. Rev. C 37, 2075 (1988)CrossRefADSGoogle Scholar
  16. 16.
    D. Lin, M.K. Liou, Z.M. Ding, Phys. Rev. C 44, 1819 (1991)CrossRefADSGoogle Scholar
  17. 17.
    G.L. Castro, A. Mariano, Phys. Lett. B 517, 339 (2001)CrossRefADSGoogle Scholar
  18. 18.
    D. Groom et al., Eur. Phys. J. C 15, 1 (2000)Google Scholar
  19. 19.
    M. Kotulla et al., Phys. Rev. Lett. 89, 272001 (2002)CrossRefADSGoogle Scholar
  20. 20.
    Th. Walcher, Prog. Part. Nucl. Phys. 24, 189 (1990)CrossRefADSGoogle Scholar
  21. 21.
    I. Anthony, J.D. Kellie, S.J. Hall, G.J. Miller, J. Ahrens, Nucl. Instrum. Methods A 301, 230 (1991)CrossRefADSGoogle Scholar
  22. 22.
    S.J. Hall, G.J. Miller, R. Beck, P. Jennewein, Nucl. Instrum. Methods A 368, 698 (1996)CrossRefADSGoogle Scholar
  23. 23.
    M. Oreglia et al., Phys. Rev. D 25, 2259 (1982)CrossRefADSGoogle Scholar
  24. 24.
    A. Starostin et al., Phys. Rev. C 64, 055205 (2001)CrossRefADSGoogle Scholar
  25. 25.
    R. Novotny, IEEE Trans. Nucl. Sci. 38, 379 (1991)CrossRefADSGoogle Scholar
  26. 26.
    A.R. Gabler et al., Nucl. Instrum. Methods A 346, 168 (1994)CrossRefADSGoogle Scholar
  27. 27.
    D. Drechsel, O. Hanstein, S.S. Kamalov, L. Tiator, Nucl. Phys. A 645, 145 (1999)CrossRefADSGoogle Scholar
  28. 28.
    D. Drechsel, S.S. Kamalov, L. Tiator, Eur. Phys. J. A 34, 69 (2007)CrossRefADSGoogle Scholar
  29. 29.
    M. Kotulla, PhD Thesis, Justus Liebig-Universität Gießen, Germany, 2001Google Scholar
  30. 30.
    A.I. Machavariani, A. Faessler, A.J. Buchmann, Nucl. Phys. A 646, 231 (1999)CrossRefADSGoogle Scholar
  31. 31.
    A.I. Machavariani, A. Faessler, A.J. Buchmann, Nucl. Phys. A 686, 601 (2002)CrossRefADSGoogle Scholar
  32. 32.
    D. Drechsel, M. Vanderhaeghen, M.M. Giannini, E. Santopinto, Phys. Lett. B 484, 236 (2000)CrossRefADSGoogle Scholar
  33. 33.
    W.T. Chiang, M. Vanderhaeghen, S.N. Yang, D. Drechsel, Phys. Rev. C 71, 015204 (2005)CrossRefADSGoogle Scholar
  34. 34.
    V. Pascalutsa, M. Vanderhaeghen, Phys. Rev. Lett. 94, 102003 (2005)CrossRefADSGoogle Scholar
  35. 35.
    V. Pascalutsa, M. Vanderhaeghen, Phys. Rev. D 77, 014027 (2008)CrossRefADSGoogle Scholar
  36. 36.
    V. Pascalutsa, D.R. Phillips, Phys. Rev. C 67, 055202 (2003)CrossRefADSGoogle Scholar
  37. 37.
    V. Pascalutsa, M. Vanderhaeghen, Phys. Rev. D 73, 034003 (2006)CrossRefADSGoogle Scholar
  38. 38.
    R.A. Arndt, I.I. Strakovsky, R.L. Workman, Phys. Rev. C 53, 430 (1996)CrossRefADSGoogle Scholar
  39. 39.
    A.V. Sarantsev et al., Phys. Lett. B 659, 94 (2008)ADSGoogle Scholar
  40. 40.
    J. Ahrens et al., Phys. Lett. B 624, 173 (2005)CrossRefADSGoogle Scholar
  41. 41.
    R. Leukel, PhD Thesis, Johannes Gutenberg-Universität Mainz, Germany, 2001Google Scholar
  42. 42.
    W.T. Chiang, S.N. Yang, M. Vanderhaeghen, D. Drechsel, Nucl. Phys. A 723, 205 (2003)ADSGoogle Scholar
  43. 43.
    M. Vanderhaeghen, private communicationGoogle Scholar
  44. 44.
    A.I. Machavariani, A. Faessler, Phys. Rev. C 72, 024002 (2005)CrossRefADSGoogle Scholar

Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • The Crystal Ball at MAMI, TAPS and A2 Collaborations
  • S. Schumann
    • 1
    • 2
    Email author
  • B. Boillat
    • 3
  • E. J. Downie
    • 1
    • 4
  • P. Aguar-Bartolomé
    • 1
  • J. Ahrens
    • 1
  • J. R. M. Annand
    • 4
  • H. J. Arends
    • 1
  • R. Beck
    • 1
    • 2
  • V. Bekrenev
    • 5
  • A. Braghieri
    • 6
  • D. Branford
    • 7
  • W. J. Briscoe
    • 8
  • J. W. Brudvik
    • 9
  • S. Cherepnya
    • 10
  • R. Codling
    • 4
  • P. Drexler
    • 11
  • 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
    • 3
  • M. Lang
    • 1
    • 2
  • V. Lisin
    • 13
  • K. Livingston
    • 4
  • S. Lugert
    • 11
  • I. J. D. MacGregor
    • 4
  • D. M. Manley
    • 15
  • M. Martinez-Fabregate
    • 1
  • J. C. McGeorge
    • 4
  • D. Mekterovic
    • 14
  • V. Metag
    • 11
  • B. M. K. Nefkens
    • 9
  • A. Nikolaev
    • 1
    • 2
  • R. Novotny
    • 11
  • M. Ostrick
    • 1
  • R. O. Owens
    • 4
  • P. Pedroni
    • 6
  • A. Polonski
    • 13
  • S. N. Prakhov
    • 9
  • J. W. Price
    • 9
  • G. Rosner
    • 4
  • M. Rost
    • 1
  • T. Rostomyan
    • 6
  • D. Sober
    • 16
  • A. Starostin
    • 9
  • I. Supek
    • 14
  • C. M. Tarbert
    • 7
  • A. Thomas
    • 1
  • M. Unverzagt
    • 1
    • 2
  • Th. Walcher
    • 1
  • D. P. Watts
    • 7
  • F. Zehr
    • 3
  1. 1.Institut für KernphysikJohannes Gutenberg-Universität MainzMainzGermany
  2. 2.Helmholtz-Institut für Strahlen- und KernphysikRheinische Friedrich-Wilhelms-Universität BonnBonnGermany
  3. 3.Institut für PhysikUniversität BaselBaselSwitzerland
  4. 4.Department of Physics and AstronomyUniversity of GlasgowGlasgowUK
  5. 5.Petersburg Nuclear Physics InstituteGatchinaRussia
  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 InstitutJustus Liebig-Universität 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