dorsal/arxiv
View Schema3He structure from coherent hard exclusive processes
| Authors | S. Scopetta |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0412108 |
| URL | https://arxiv.org/abs/nucl-th/0412108 |
| DOI | 10.1142/9789812701985_0023 |
Abstract
Hard exclusive processes, such as deep electroproduction of photons and mesons off nuclear targets, could give access, in the coherent channel, to nuclear generalized parton distributions (GPDs). Here, a realistic microscopic calculation of the unpolarized quark GPD H_q of the 3He nucleus is reviewed. In Impulse Approximation, H_q is obtained as 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. Another feature of the obtained results is 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": "Hard exclusive processes, such as deep electroproduction of photons and\nmesons off nuclear targets, could give access, in the coherent channel, to\nnuclear generalized parton distributions (GPDs). Here, a realistic microscopic\ncalculation of the unpolarized quark GPD H_q of the 3He nucleus is reviewed. In\nImpulse Approximation, H_q is obtained as a convolution between the GPD of the\ninternal nucleon and the non-diagonal spectral function, describing properly\nFermi motion and binding effects. The obtained formula has the correct limits.\nNuclear effects, evaluated by a modern realistic potential, are found to be\nlarger than in the forward case. In particular, they increase with increasing\nthe momentum transfer and the asymmetry of the process. Another feature of the\nobtained results is that the nuclear GPD cannot be factorized into a\nDelta^2-dependent and a Delta^2-independent term, as suggested in prescriptions\nproposed for finite nuclei. The dependence of the obtained GPDs on different\nrealistic potentials used in the calculation shows that these quantities are\nsensitive to the details of nuclear structure at short distances.",
"arxiv_id": "nucl-th/0412108",
"authors": [
"S. Scopetta"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1142/9789812701985_0023",
"title": "3He structure from coherent hard exclusive processes",
"url": "https://arxiv.org/abs/nucl-th/0412108"
},
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