Abstract
Exclusive production of ρ0 and φ mesons on hydrogen and deuterium targets is studied in the HERMES kinematic region 1<Q2<7 GeV2 and 3.0<W<6.3 GeV. Spin density matrix elements are presented. Violation of s‐Channel Helicity Conservation is observed through several non‐zero values of SDMEs for ρ0, but not for φ. In exclusive ρ0 production on the proton an indication is observed of a contribution of unnatural‐parity exchange amplitudes, for which the dependence on Q2 and t′ is shown.
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