2009 **Abstract:** Spin Density Matrix Elements (SDMEs) describing the angular distribution of exclusive ρ 0 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 < Q 2 < 7 GeV 2 , 3.0 < W < 6.3 GeV, and −t < 0.4 GeV 2. Within the given experimental uncertainties, a hierarchy of relative sizes of helicity amp…

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(110 citation statements)

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“…[15,16] that factorization also holds for the amplitudes F 1 1 2 1± 1 2 and F 0 1 2 1± 1 2 , which describe the transition from a transversely polarized virtual photon to a transversely polarized meson, γ * T → V T , and a longitudinally polarized meson, γ * T → V L , respectively. The agreement found between certain calculated SDMEs and those extracted from HERMES [17], ZEUS [18], and H1 [19] data supports this assumption. In general, the differential and total cross sections for ρ 0 -meson production by virtual photons are reasonably well described in the GPD-based approach of Refs.…”

confidence: 66%

“…[15,16] that factorization also holds for the amplitudes F 1 1 2 1± 1 2 and F 0 1 2 1± 1 2 , which describe the transition from a transversely polarized virtual photon to a transversely polarized meson, γ * T → V T , and a longitudinally polarized meson, γ * T → V L , respectively. The agreement found between certain calculated SDMEs and those extracted from HERMES [17], ZEUS [18], and H1 [19] data supports this assumption. In general, the differential and total cross sections for ρ 0 -meson production by virtual photons are reasonably well described in the GPD-based approach of Refs.…”

confidence: 66%

“…Contributions of squares of moduli of the helicity-amplitude ratios u (1) 01 , u (1) 10 , u (1) 1−1 to u λ V λ V λ γ λ γ are much smaller than the contribution of |u (1) 11 | 2 according to the hierarchy of amplitudes established in Refs. [17] and [27]. The small helicity amplitude ratios u (1) λ V λ γ with λ V = λ γ contribute linearly to the SDMEs l λ V λ V λ γ λ γ .…”

confidence: 96%