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The (spin) structure of the nucleon

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Abstract.

A selection of new data obtained by the HERMES experiment at DESY is presented, which provides new insight into the QCD structure of the nucleon. Using polarized lepton beams and polarized targets, the spin-dependent structure function g 1(x) has been determined for 1 H, 2 H and 3 He. By also observing one of the produced hadrons it has been possible to extract the polarization distribution of individual quark flavours in the nucleon as well. Further information on nucleon structure has been obtained by observing (almost) exclusive reactions, which can be interpreted in terms of the recently introduced generalized parton distributions (GPDs). As an example of such data measurements of both the beam-spin and beam-charge asymmetries resulting from deeply virtual Compton scattering (DVCS) are presented. By embedding the deep-inelastic scattering process in the nuclear environment additional information can be obtained on nucleon structure and some QCD effects. The potential of this technique is illustrated by showing new results on tagged structure functions and hadronization in nuclei.

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Author information

Authors and Affiliations

  1. Nationaal Instituut voor Kernfysica en Hoge-Energiefysica (NIKHEF), P.O. Box 41882, 1009 DB, Amsterdam, The Netherlands

    G. van der Steenhoven

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  1. G. van der Steenhoven
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Correspondence to G. van der Steenhoven.

Additional information

Received: 30 September 2002, Published online: 22 October 2003

PACS:

13.60.Hb Total and inclusive cross-sections (including deep-inelastic processes) - 13.88. + e Polarization in interactions and scattering - 14.20.Dh Protons and neutrons - 24.85. + p Quarks, gluons, and QCD in nuclei and nuclear processes

G. van der Steenhoven: For the HERMES Collaboration

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van der Steenhoven, G. The (spin) structure of the nucleon. Eur. Phys. J. A 18, 377–381 (2003). https://doi.org/10.1140/epja/i2002-10240-4

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  • DOI: https://doi.org/10.1140/epja/i2002-10240-4

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