Abstract
Spin density matrix elements were extracted from COMPASS data for exclusive \rho^{0}ρ0 meson muoproduction on a liquid hydrogen target. The measurement cover the kinematic range of 1.0 (GeV/cc)^22< Q^{2} <<Q2< 10.0 (GeV/cc)^22, 5.0 GeV/c^2c2< W <<W< 17.0 GeV/c^2c2 and 0.01 (GeV/cc)^22<p^{2}_{T}<<pT2< 0.5 (GeV/cc)^22. Here, WW denotes the mass of the final hadronic system, Q^{2}Q2 the virtuality of the exchanged photon and p_{T}pT the transverse momentum of the \rho^{0}ρ0 meson with respect to the virtual-photon direction. We observe a violation of s-channel helicity conservation for the transition \gamma^{*}_{T} \to \rho^{0}_{L}γT*→ρL0. Additionally, we find a dominant contribution of the natural-parity-exchange transitions.
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