The European Physical Journal A

, Volume 31, Issue 4, pp 575–577 | Cite as

Longitudinal and transverse target-spin asymmetries associated with DVCS on the proton at HERMES

  • M. KopytinEmail author
QNP 2006


Measurements of azimuthal cross-section asymmetries from deeply virtual Compton scattering on transversely and longitudinally polarized hydrogen and longitudinally polarized deuterium targets at HERMES are reported. By comparing the HERMES results on the transverse target-spin asymmetry with theoretical calculations based on a phenomenological model of generalized parton distributions, a model-dependent constraint on the total angular momentum carried by quarks in the nucleon is obtained.


13.60.-r Photon and charged-lepton interactions with hadrons 24.85.+p Quarks, gluons, and QCD in nuclei and nuclear processes 13.60.Fz Elastic and Compton scattering 13.88.+e Polarization in interactions and scattering 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    D. Mueller, Fortschr. Phys. 42, 101 (1994) hep-ph/9812448.Google Scholar
  2. 2.
    A. Radyushkin, Phys. Lett. B 385, 333 (1996) hep-ph/9605431.CrossRefADSGoogle Scholar
  3. 3.
    X. Ji, Phys. Rev. Lett. 78, 610 (1997) hep-ph/9603249.CrossRefADSGoogle Scholar
  4. 4.
    A. Belitsky, D. Müller, A. Kirchner, Nucl. Phys. B 629, 323 (2002) hep-ph/0112108.CrossRefADSGoogle Scholar
  5. 5.
    F. Ellinghaus, W.D. Nowak, A.V. Vinnikov, Z. Ye, Eur. Phys. J. C 46, 729 (2006) hep-ph/0506264.CrossRefADSGoogle Scholar
  6. 6.
    HERMES Collaboration (K. Ackerstaff), Nucl. Instrum. Methods A 417, 230 (1998) hep-ex/9806008.CrossRefGoogle Scholar
  7. 7.
    HERMES Collaboration (Z. Ye), PoS (HEP2005) 120 (2006) hep-ex/0512010.Google Scholar
  8. 8.
    K. Goeke, M. Polyakov, M. Vanderhaegen, Prog. Part. Nucl. Phys. 47, 401 (2001) hep-ph/0106012.CrossRefADSGoogle Scholar
  9. 9.
    HERMES Collaboration (M. Kopytin), AIP Conf. Proc. 792, 424 (2005).CrossRefADSGoogle Scholar
  10. 10.
    M. Vanderhaeghen, P. Guichon, M. Guidal, Computer code for the calculation of DVCS and BH processes in the reaction $ep\rightarrow ep\gamma$ (2001), private communication.Google Scholar
  11. 11.
    HERMES Collaboration (Z. Ye), hep-ex/0606061 (2006).Google Scholar
  12. 12.
    HERMES Collaboration (A. Airapetian), hep-ex/0605108 (2006).Google Scholar

Copyright information

© Società Italiana di Fisica and Springer-Verlag 2007

Authors and Affiliations

  1. 1.DESYZeuthenGermany

Personalised recommendations