Production of Polarized Vector Mesons off Nuclei

Details Production of Polarized Vector Mesons off Nuclei Production of Polarized Vector Mesons off Nuclei

2007-03-12

arxiv.org/abs/hep-ph/0703118v1

Phys.Rev.C76:025210,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

Revtex 24 pages and 14 figures

Scientific paper

10.1103/PhysRevC.76.025210

Using the light-cone QCD dipole formalism we investigate manifestations of color transparency (CT) and coherence length (CL) effects in electroproduction of longitudinally (L) and transversally (T) polarized vector mesons. Motivated by forthcoming data from the HERMES experiment we predict both the A and Q^2 dependence of the L/T- ratios, for rho^0 mesons produced coherently and incoherently off nuclei. For an incoherent reaction the CT and CL effects add up and result in a monotonic A dependence of the L/T-ratio at different values of Q^2. On the contrary, for a coherent process the contraction of the CL with Q^2 causes an effect opposite to that of CT and we expect quite a nontrivial A dependence, especially at Q^2 >> m_V^2.

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