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Czechoslovak Journal of Physics

, Volume 50, Supplement 1, pp 35–44 | Cite as

Physics results from HERMES

  • Ralf Kaiser
Part I New Experimental Results and Future Spin Physics Projects
  • 24 Downloads

Abstract

The Hermes experiment at the Desy laboratory in Hamburg, Germany, studies the spin structure of the nucleon. Its unique feature is the combination of a polarized internal gas target with the longitudinally polarized 27.5 GeV electron/positron beam of the Hera accelerator. Recent Hermes measurements include the proton spin structure function g 1 p , the flavor decomposition of the polarized quark distributions in the nucleon, the DIS contribution to the generalized GDH sum rule, the first observation of a spin asymmetry in exclusive vector meson production and the first observation of a single-spin azimuthal asymmetry in semi-inclusive pion production. Additionally, the possibility of using various unpolarized gases as target material broadens the spectrum of physics measurements with Hermes.

Keywords

Virtual Photon Spin Asymmetry Nucleon Spin HERMES Collaboration Spin Structure Function 
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.

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References

  1. [1]
    HERMES Collaboration, K. Ackerstaff et al., Nucl. Inst. Meth. A417 (1998) 230.CrossRefGoogle Scholar
  2. [2]
    A.A. Sokolov and I.M. Ternov, Sov. Phys. Doklady 8 (1964) 1203.ADSGoogle Scholar
  3. [3]
    D.P. Barber et al., Nucl. Inst. Meth. A329 (1993) 79.CrossRefADSGoogle Scholar
  4. [4]
    A. Most, Proceedings of SPIn 97, Amsterdam 1997, ed. by C.W. de Jager et al., World Scientific (1997) 800.Google Scholar
  5. [5]
    R. Kaiser, these proceedings.Google Scholar
  6. [6]
    E143 Collaboration, K. Abe et al., Phys. Rev. D 58 (1998) 112003.CrossRefGoogle Scholar
  7. [7]
    E155 Collaboration, P.L. Anthony et al., Phys. Lett. B 458 (1999) 529.CrossRefADSGoogle Scholar
  8. [8]
    HERMES Collaboration, A. Airapetian et al., Phys. Lett. B 442 (1998) 484.CrossRefGoogle Scholar
  9. [9]
    E143 Collaboration, K. Abe et al., Phys. Rev. Lett. 74 (1995) 346.CrossRefADSGoogle Scholar
  10. [10]
    E154 Collaboration, K. Abe et al., Phys. Rev. Lett. 79 (1997) 26.CrossRefADSGoogle Scholar
  11. [11]
    SMC Collaboration, D. Adams et al., Phys. Rev. D 56 (1997) 5330, B. Adeva et al., Phys. Lett. B 412 (1997) 414.CrossRefADSGoogle Scholar
  12. [12]
    HERMES Collaboration, K. Ackerstaff et al., Phys. Lett. B 404 (1997) 383.CrossRefADSGoogle Scholar
  13. [13]
    S.B. Gerasimov, Sov. J. Nucl. Phys. 2 (1966) 430, S.D. Drell and A.C. Hearn, Phys. Rev. Lett 16 (1966) 908.Google Scholar
  14. [14]
    F.J. Gilman, Phys. Rev. 167 (1968) 1365.CrossRefADSGoogle Scholar
  15. [15]
    M. Glück et al, Phys. Rev. D 53 (1996) 4775.CrossRefADSGoogle Scholar
  16. [16]
    HERMES Collaboration, K. Ackerstaff et al. Phys. Lett. B 444 (1998) 531.CrossRefGoogle Scholar
  17. [17]
    M. Glück et al., Phys. Rev. D 53 (1996) 6620.CrossRefADSGoogle Scholar
  18. [18]
    HERMES Collaboration, K. Ackerstaff et al., Phys. Lett. B (in press), hep-ex/9906035.Google Scholar
  19. [19]
    SMC Collaboration, B. Adeva et al. Phys. Lett. B 420 (1998) 180.CrossRefGoogle Scholar
  20. [20]
    M. Vänttinen and L. Manciewicz, hep-ph/9805338 and hep-ph/9807287.Google Scholar
  21. [21]
    S. Borissov, Proceedings of DIS99, Zeuthen, April 1999., HERMES 99-206.Google Scholar
  22. [22]
    F. Meissner, ibid. Proceedings of DIS99, Zeuthen, April 1999, HERMES 99-026.Google Scholar
  23. [23]
    J. Collins, Nucl. Phys. B396 (1993) 161.CrossRefADSGoogle Scholar
  24. [24]
    A.M. Kotzinian, Nucl. Phys. B441 (1995) 234.CrossRefADSGoogle Scholar
  25. [25]
    P.J. Mulders and R.D. Tangerman, Nucl. Phys B461, (1996) 197.CrossRefADSGoogle Scholar
  26. [26]
    HERMES Collaboration, A. Airapetian et al., hep-ex/9910062.Google Scholar
  27. [27]
    P. Mulders and M. Boglione hep-ph/9907356.Google Scholar
  28. [28]
    K.A. Oganessyan, hep-ph/9908446.Google Scholar
  29. [29]
    A. Brandenburg, D. Müller and O. Teryaev, Phys. Rev. D 53 (1996) 6180.CrossRefADSGoogle Scholar
  30. [30]
    M. Anselmino, M. Boglione and F. Murgia, hep-ph/9810228.Google Scholar
  31. [31]
    V. Korotkov, these proceedings.Google Scholar
  32. [32]
    S. Belostotski, these proceedings.Google Scholar

Copyright information

© Institute of Phycics, Acad. Sci. CR 2000

Authors and Affiliations

  • Ralf Kaiser
    • 1
  1. 1.DESY ZeuthenZeuthen

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