Dresden 2000 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK II: HV II
HK II.1: Hauptvortrag
Dienstag, 21. März 2000, 14:45–15:15, H 04
Perspectives of hard electroproduction and generalized parton distributions — •M. Vanderhaeghen1, P.A.M. Guichon2 und M. Guidal3 — 1Institut für Kernphysik, Johannes Gutenberg Universität Mainz, Germany — 2CEA-Saclay, France — 3IPN Orsay, France
We give predictions for the leading order amplitudes for deeply virtual Compton scattering and hard meson electroproduction reactions at large Q2 in the valence region in terms of skewed parton distributions (SPD’s) [1,2]. We give first estimates for the power corrections to these leading order amplitudes [3]. We furthermore report on an extension of the SPD formalism to strangeness and π Δ electroproduction, using large Nc relations [4]. Transverse spin asymmetries are predicted to be large for many of these reactions. In particular, we outline several examples of experimental opportunities to access the SPD’s at the current high-energy lepton facilities : JLab [5], HERMES and COMPASS, and show the potential for fixed target and collider projects.
[1] M. Vanderhaeghen, P.A.M. Guichon and M. Guidal, Phys.Rev.Lett. 80, 5064 (1998).
[2] P.A.M. Guichon and M. Vanderhaeghen, Prog.Part.Nucl.Phys. 41, 125 - 190 (1998).
[3] M. Vanderhaeghen, P.A.M. Guichon and M. Guidal, Phys.Rev.D. 60, 094017 (1999).
[4] L.L. Frankfurt, M.V. Polyakov, M. Strikman and M. Vanderhaeghen, Phys.Rev.Lett., submitted for publication.
[5] JLab experiment E98-107/E99-105, spokespersons M. Guidal, C. Marchand and E. Smith.