Determination of the $ \eta$ mass with the Crystal Ball at MAMI-B (original) (raw)

Abstract.

A new precise determination of the \( \eta\) meson mass is presented. It is based on a measurement of the threshold for the \( \gamma p\rightarrow p\eta\) reaction using the tagger focal-plane microscope detector at the MAMI-B facility in Mainz. The tagger microscope has a higher energy resolution than the standard tagging spectrometer and, hence, allowed an improvement in the accuracy compared to the previous \( \eta\) mass measurement at MAMI-B. Special emphasis was put on a very careful energy calibration of the electron beam and the tagging device, which reduced considerably the systematic uncertainty compared to the previous MAMI experiment. The result \( m_{\eta}=(547.865 \pm 0.031_{stat.}\pm 0.062_{syst.})\) MeV agrees very well with the precise values of the NA48, KLOE, CLEO and COSY-ANKE Collaborations and deviates by \( 6\sigma\) from the smaller value obtained by the GEM Collaboration at COSY.

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References

  1. J. Beringer et al., Phys. Rev. D 86, 010001 (2012)
    Article ADS Google Scholar
  2. A. Duane et al., Phys. Rev. Lett. 32, 425 (1974)
    Article ADS Google Scholar
  3. F. Plouin et al., Phys. Lett. B 276, 526 (1992)
    Article ADS Google Scholar
  4. B. Krusche et al., Z. Phys. A 351, 237 (1995)
    Article ADS Google Scholar
  5. PDG Collaboration (D.E. Groom et al.), Eur. Phys. J. C 15, 1 (2000)
    Google Scholar
  6. A. Lai et al., Phys. Lett. B 533, 196 (2002)
    Article ADS Google Scholar
  7. PDG Collaboration (S. Eidelman et al.), Phys. Lett. B 592, 1 (2004)
    Article ADS Google Scholar
  8. M. Abdel-Bary et al., Phys. Lett. B 619, 281 (2005)
    Article ADS Google Scholar
  9. F. Ambrosino et al., JHEP 12, 073 (2007)
    Google Scholar
  10. D.H. Miller et al., Phys. Rev. Lett. 99, 122002 (2007)
    Article ADS Google Scholar
  11. P. Goslawski et al., Phys. Rev. D 85, 112011 (2012)
    Article ADS Google Scholar
  12. H. Herminghaus et al., Nucl. Instrum. Methods A 138, 1 (1976)
    Article Google Scholar
  13. Th. Walcher, Prog. Part. Nucl. Phys. 24, 189 (1990)
    Article ADS Google Scholar
  14. M. Oreglia et al., Phys. Rev. D 25, 2259 (1982)
    Article ADS Google Scholar
  15. A. Starostin et al., Phys. Rev. C 64, 055205 (2001)
    Article ADS Google Scholar
  16. A. Reiter et al., Eur. Phys. J. A 30, 461 (2006)
    Article ADS Google Scholar
  17. A. Nikolaev, PhD Thesis, Rheinische Friedrich-Wilhelms-Universität Bonn (2011)
  18. A. Jankowiak, Compilation of: Measurement of the electron beam energy at the Mainz Microtron, MAMI Internal Report 03/2006, Institut für Kernphysik, Mainz (2006)
  19. A. Jankowiak, Eur. Phys. J. A 28, 149 (2006)
    Article ADS Google Scholar
  20. I. Anthony et al., Nucl. Instrum. Methods A 301, 230 (1991)
    Article ADS Google Scholar
  21. S.J. Hall et al., Nucl. Instrum. Methods A 368, 698 (1996)
    Article ADS Google Scholar
  22. 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
  23. R. Novotny, IEEE Trans. Nucl. Sc. 38, 392 (1991)
    Article Google Scholar
  24. Th. Dörk, Diploma Thesis, Institut für Kernphysik, Johannes Gutenberg-Universität Mainz (1996)
  25. W.-T. Chiang, S.N. Yang, L. Tiator, D. Drechsel, Nucl. Phys. A 700, 429 (2002)
    Article ADS Google Scholar
  26. B. Krusche et al., Phys. Rev. Lett. 74, 3736 (1995)
    Article ADS Google Scholar
  27. E. McNicoll et al., Phys. Rev. C 82, 035208 (2010)
    Article ADS Google Scholar
  28. S. Schumann et al., Eur. Phys. J. A 43, 269 (2010)
    Article ADS Google Scholar

Download references

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Authors and Affiliations

  1. Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, Bonn, Germany
    A. Nikolaev, R. Beck, M. Lang, S. Schumann & M. Unverzagt
  2. Institut für Kernphysik, University Mainz, Mainz, Germany
    P. Aguar-Bartolomé, J. Ahrens, H. J. Arends, M. Dehn, E. Heid, O. Jahn, A. Jankowiak, K. -H. Kaiser, V. L. Kashevarov, D. Krambrich, U. Ludwig-Mertin, M. Martinez-Fabregate, A. Reiter, M. Rost, S. Schumann, A. Thomas, M. Unverzagt & Th. Walcher
  3. Department of Physics and Astronomy, University of Glasgow, Glasgow, UK
    J. R. M. Annand, R. Codling, E. J. Downie, K. Livingston, I. J. D. MacGregor, J. C. McGeorge, R. O. Owens, A. Reiter & G. Rosner
  4. Petersburg Nuclear Physics Institute, Gatchina, Russia
    V. Bekrenev
  5. Institut für Physik, University Basel, Basel, Switzerland
    B. Boillat, B. Krusche, T. Rostomyan & F. Zehr
  6. INFN, Sezione di Pavia, Pavia, Italy
    A. Braghieri, P. Pedroni & T. Rostomyan
  7. School of Physics, University of Edinburgh, Edinburgh, UK
    D. Branford, D. I. Glazier, C. M. Tarbert & D. P. Watts
  8. Center for Nuclear Studies, The George Washington University, Washington, USA
    W. J. Briscoe
  9. University of California Los Angeles, Los Angeles, California, USA
    J. W. Brudvik, B. M. K. Nefkens, S. N. Prakhov, J. W. Price & A. Starostin
  10. Lebedev Physical Institute, Moscow, Russia
    S. Cherepnya, L. V. Fil’kov & V. L. Kashevarov
  11. II. Physikalisches Institut, University Gießen, Gießen, Germany
    R. Gregor, M. Kotulla, S. Lugert, V. Metag & R. Novotny
  12. Mount Allison University, Sackville, Canada
    D. Hornidge
  13. Institute for Nuclear Research, Moscow, Russia
    R. Kondratiev, V. Lisin & A. Polonski
  14. Rudjer Boskovic Institute, Zagreb, Croatia
    M. Korolija, D. Mekterovic & I. Supek
  15. Kent State University, Kent, Ohio, USA
    D. M. Manley
  16. The Catholic University of America, Washington, USA
    D. Sober

Authors

  1. A. Nikolaev
  2. P. Aguar-Bartolomé
  3. J. Ahrens
  4. J. R. M. Annand
  5. H. J. Arends
  6. R. Beck
  7. V. Bekrenev
  8. B. Boillat
  9. A. Braghieri
  10. D. Branford
  11. W. J. Briscoe
  12. J. W. Brudvik
  13. S. Cherepnya
  14. R. Codling
  15. M. Dehn
  16. E. J. Downie
  17. L. V. Fil’kov
  18. D. I. Glazier
  19. R. Gregor
  20. E. Heid
  21. D. Hornidge
  22. O. Jahn
  23. A. Jankowiak
  24. K. -H. Kaiser
  25. V. L. Kashevarov
  26. R. Kondratiev
  27. M. Korolija
  28. M. Kotulla
  29. D. Krambrich
  30. B. Krusche
  31. M. Lang
  32. V. Lisin
  33. K. Livingston
  34. U. Ludwig-Mertin
  35. S. Lugert
  36. I. J. D. MacGregor
  37. D. M. Manley
  38. M. Martinez-Fabregate
  39. J. C. McGeorge
  40. D. Mekterovic
  41. V. Metag
  42. B. M. K. Nefkens
  43. R. Novotny
  44. R. O. Owens
  45. P. Pedroni
  46. A. Polonski
  47. S. N. Prakhov
  48. J. W. Price
  49. A. Reiter
  50. G. Rosner
  51. M. Rost
  52. T. Rostomyan
  53. S. Schumann
  54. D. Sober
  55. A. Starostin
  56. I. Supek
  57. C. M. Tarbert
  58. A. Thomas
  59. M. Unverzagt
  60. Th. Walcher
  61. D. P. Watts
  62. F. Zehr

Consortia

The Crystal Ball at MAMI, TAPS and A2 Collaborations

Corresponding author

Correspondence toR. Beck.

Additional information

Communicated by E. De Sanctis

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The Crystal Ball at MAMI, TAPS and A2 Collaborations., Nikolaev, A., Aguar-Bartolomé, P. et al. Determination of the \( \eta\) mass with the Crystal Ball at MAMI-B.Eur. Phys. J. A 50, 58 (2014). https://doi.org/10.1140/epja/i2014-14058-1

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