Measurements of the p(e;e p)πo reaction in the ∆(1232) resonance region have been performed with the CLAS detector at Jefferson Lab using beam energies of 1.645 and 2.445 GeV. Cross sections were measured over a range of four-momentum transfer Q2= 0.4-1.8 (GeV/c)2. Decay angular distributions in the πo p center-of-mass were obtained with full coverage in cosθ π and φ π. This permits the extract...

We present some estimates for the reaction ~ ep ! e 0 +. At small scattering angles, the diierential cross section is completely determined by the experimental data for the radiative decay + ! pp. For kinematical values typical of the proposed parity experiment at MAMI, we nd a suppression factor of about 5 10 ?15 as compared to elastic electron scattering. On the basis of conservative models f...

In the present paper we investigate incoherent ρ 0 electroproduction off complex nuclei. We derive a novel, simple expression for the incoherent elec-troproduction cross section in which one can clearly separate the final state interactions of the reaction products from the 'initial state interactions' of the photon that give rise to nuclear shadowing. In the special case of purely absorptive f...

Spin Density Matrix Elements (SDMEs) describing the angular distribution of exclusive ρ electroproduction and decay are determined in the HERMES experiment with 27.6 GeV beam energy and unpolarized hydrogen and deuterium targets. Eight (fifteen) SDMEs that are related (unrelated) to the longitudinal polarization of the beam are extracted in the kinematic region 1 GeV < Q < 7 GeV, 3.0 GeV < W < ...