Preliminary results from exclusive production of \rho 0 mesons at the COMPASS experiment at CERN, using a 160 GeV polarized muon beam and a large polarized nuclear target, are presented. The studied reaction is exclusive incoherent \rho 0 production, \mu N \rightarrow \mu N \rho 0, with N being the nucleon in any of the nuclei of the target. The measurements were done in a wide range of Q2: 0.01 < Q2 < 10 GeV2, at {\langle W \rangle} \approx 10 GeV. The results for r0400, r11 -1, r041 -1 and {Im} r31 -1 \rho 0 spin density matrix elements and the ratio R = \sigma L / \sigma T, based on 700 000 events selected from the year 2002 data, are shown and commented.
PACS numbers: 13.60.Le, 14.40.Cs, 13.88.+e
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