Exclusive production of φ mesons on hydrogen and deuterium targets is studied in the HERMES kinematic region 1 < Q 2 < 7 GeV 2 and 3.0 < W < 6.3 GeV. Spin density matrix elements and their Q 2 and t dependences are presented. These data are consistent with s-channel helicity conservation in exclusive φ meson production. No statistically significant evidence for the contribution of unnatural-parity-exchange amplitudes is found.
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