dorsal/arxiv
View Schema3He structure and generalized parton distribution
| Authors | Sergio Scopetta |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0509072 |
| URL | https://arxiv.org/abs/nucl-th/0509072 |
Abstract
Nuclear Generalized Parton Distributions (GPDs), a unique tool to access several crucial features of nuclear structure, could be measured in the coherent channel of hard exclusive processes, such as deep electroproduction of photons and mesons off nuclear targets. Here, a realistic microscopic calculation of the unpolarized quark GPD H_q^3 of the ^3He nucleus is described. In Impulse Approximation, H_q^3 is shown to be given by a convolution between the GPD of the internal nucleon and the non-diagonal spectral function, describing properly Fermi motion and binding effects. The obtained formula has the correct limits. Nuclear effects, evaluated by a modern realistic potential, are found to be larger than in the forward case. In particular, they increase with increasing the momentum transfer and the asymmetry of the process. Besides, it is found that the nuclear GPD cannot be factorized into a \Delta^2-dependent and a \Delta^2-independent term, as suggested in prescriptions proposed for finite nuclei. The dependence of the obtained GPDs on different realistic potentials used in the calculation shows that these quantities are sensitive to the details of nuclear structure at short distances.
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"abstract": "Nuclear Generalized Parton Distributions (GPDs), a unique tool to access\nseveral crucial features of nuclear structure, could be measured in the\ncoherent channel of hard exclusive processes, such as deep electroproduction of\nphotons and mesons off nuclear targets. Here, a realistic microscopic\ncalculation of the unpolarized quark GPD H_q^3 of the ^3He nucleus is\ndescribed. In Impulse Approximation, H_q^3 is shown to be given by a\nconvolution between the GPD of the internal nucleon and the non-diagonal\nspectral function, describing properly Fermi motion and binding effects. The\nobtained formula has the correct limits. Nuclear effects, evaluated by a modern\nrealistic potential, are found to be larger than in the forward case. In\nparticular, they increase with increasing the momentum transfer and the\nasymmetry of the process. Besides, it is found that the nuclear GPD cannot be\nfactorized into a \\Delta^2-dependent and a \\Delta^2-independent term, as\nsuggested in prescriptions proposed for finite nuclei. The dependence of the\nobtained GPDs on different realistic potentials used in the calculation shows\nthat these quantities are sensitive to the details of nuclear structure at\nshort distances.",
"arxiv_id": "nucl-th/0509072",
"authors": [
"Sergio Scopetta"
],
"categories": [
"nucl-th",
"hep-ph"
],
"title": "3He structure and generalized parton distribution",
"url": "https://arxiv.org/abs/nucl-th/0509072"
},
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