par Clerbaux, Barbara 
Référence Nuclear physics. B, Proceedings supplement, 79, 1-3, page (327-329)
Publication Publié, 1999-10
Référence Nuclear physics. B, Proceedings supplement, 79, 1-3, page (327-329)
Publication Publié, 1999-10
Article révisé par les pairs
| Résumé : | Results on elastic electroproduction of ρ mesons are presented for a photon virtuality in the range 1 < Q 2 < 60 GeV 2 and for a hadronic center of mass energy in the range 30 < W < 140 GeV. The shape of the (ππ) mass distribution is discussed and measurements of the cross section dependences on Q 2, W and t (the four-momentum transfer squared to the proton) are presented. The full set of γ spin density matrix elements is measured, providing information on the γ meson and on the photon polarization states. In particular, the ratio R of longitudinal to transverse γ*p cross section is determined. |
