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Coherent deeply virtual Compton scattering off 4He
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DOI：10.1103/PhysRevC.98.015203.png)
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摘要
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Coherent deeply virtual Compton scattering off the He-4 nucleus is studied in impulse approximation. A convolution formula for the nuclear generalized parton distribution (GPD) is derived in terms of the He-4 one-body nondiagonal spectral function and of the GPD of the struck nucleon. A model of the nuclear nondiagonal spectral function, based on the momentum distribution corresponding to the Argonne 18 nucleon-nucleon interaction, is used in the actual calculation. Typical impulse approximation results are reproduced, in proper limits, for the nuclear form factor and for nuclear parton distributions. The nuclear generalized parton distribution and the Compton form factor are evaluated using, as a nucleonic ingredient, a well-known generalized parton distribution model. An overall very good agreement is found with the data recently published by the EG6 experiment at the Jefferson Laboratory (JLab). More refined nuclear calculations are addressed and will be necessary for the expected improved accuracy of the next generation of experiments at JLab with the 12-GeV electron beam and high luminosity.
Keyword:
GENERALIZED PARTON DISTRIBUTIONS
SPECTRAL-FUNCTION
NUCLEON SYSTEMS
ELECTROPRODUCTION
MESONS
MODEL
GPDS
DVCS
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期刊
IF:
3.4
论文数:
2.9W
被引数:
5.7W
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