München 2006 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
HK: Physik der Hadronen und Kerne
HK 15: Elektromagnetische und Hadronische Sonden
HK 15.5: Vortrag
Dienstag, 21. März 2006, 15:15–15:30, F
Beam spin azimuthal asymmetry at CLAS and HERMES — •Christoph Cebulla1, Klaus Goeke1, Peter Schweitzer1, and Diana Urbano2 — 1Theoretische Physik II, Ruhr-Universität Bochum, 44801 Bochum — 2Faculdade de Engenharia da Universidade do Porto, R. Dr. Roberto Frias s/n, P-4200-465 Porto, Portugal
Recently azimuthal beam spin asymmetries in the production of pions in semi-inclusive deeply inelastic scattering were measured in the CLAS experiment at the Jefferson Lab and the HERMES expriment at DESY. One (but not the only) contribution to this single spin asymmetry is due to the Collins effect and the chirally odd twist-3 distribution function $e(x)$. We compute $e(x)$ in the chiral quark-soliton model and estimate how much of the CLAS and HERMES data on the beam spin asymmetry can be explained in terms of $e(x)$ and the Collins effect.