Color Transparency versus Quantum Coherence in Electroproduction of Vector Mesons off Nuclei

Details Color Transparency versus Quantum Coherence in Electroproduction of Vector Mesons off Nuclei Color Transparency versus Quantum Coherence in Electroproduction of Vector Mesons off Nuclei

2001-07-23

arxiv.org/abs/hep-ph/0107227v1

Phys.Rev. C65 (2002) 035201

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex 57 pages and 17 figures

Scientific paper

10.1103/PhysRevC.65.035201

So far no theoretical tool for the comprehensive description of exclusive electroproduction of vector mesons off nuclei at medium energies has been developed. We suggest a light-cone QCD formalism which is valid at any energy and incorporates formation effects (color transparency), the coherence length and the gluon shadowing. At medium energies color transparency (CT) and the onset of coherence length (CL) effects are not easily separated. Indeed, although nuclear transparency measured by the HERMES experiment rises with Q^2, it agrees with predictions of the vector dominance model (VDM) without any CT effects. Our new results and observations are: (i) the good agreement with the VDM found earlier is accidental and related to the specific correlation between Q^2 and CL for HERMES kinematics; (ii) CT effects are much larger than have been estimated earlier within the two channel approximation. They are even stronger at low than at high energies and can be easily identified by HERMES or at JLab; (iii) gluon shadowing which is important at high energies is calculated and included; (iv) our parameter-free calculations explain well available data for variation of nuclear transparency with virtuality and energy of the photon; (v) predictions for electroproduction of \rho and \phi are provided for future measurements at HERMES and JLab.

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