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  Color transparency versus quantum coherence in electroproduction of vector mesons off nuclei

Kopeliovich, B. Z., Nemchik, J., Schafer, A., & Tarasov, A. V. (2002). Color transparency versus quantum coherence in electroproduction of vector mesons off nuclei. Physical Review C, 65(3): 035201, pp. 035201-035201.

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 Creators:
Kopeliovich, B. Z.1, Author              
Nemchik, J.2, Author
Schafer, A.2, Author
Tarasov, A. V.2, Author
Affiliations:
1Prof. Bogdan Povh, Emeriti, MPI for Nuclear Physics, Max Planck Society, ou_907545              
2Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany; Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia; Slovak Acad Sci, Inst Expt Phys, Kosice 04353, Slovakia, ou_persistent22              

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 Abstract: 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 that 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 as follows. (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 energies 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; and (v) predictions for electroproduction of rho and phi are provided for future measurements at HERMES and JLab.

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Language(s): eng - English
 Dates: 2002-03
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 31344
ISI: 000174548200080
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Title: Physical Review C
  Alternative Title : Phys. Rev. C
Source Genre: Journal
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Pages: - Volume / Issue: 65 (3) Sequence Number: 035201 Start / End Page: 035201 - 035201 Identifier: ISSN: 0556-2813