dorsal/arxiv
View SchemaGeneralized Parton Distributions of ^3He
| Authors | Sergio Scopetta |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0404014 |
| URL | https://arxiv.org/abs/nucl-th/0404014 |
| DOI | 10.1103/PhysRevC.70.015205 |
| Journal | Phys.Rev. C70 (2004) 015205 |
Abstract
A realistic microscopic calculation of the unpolarized quark Generalized Parton Distribution (GPD) $H_q^3$ of the $^3He$ nucleus is presented. In Impulse Approximation, $H_q^3$ 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 proposed scheme is valid at low values of $\Delta^2$, the momentum transfer to the target, the most relevant kinematical region for the coherent channel of hard exclusive processes. The obtained formula has the correct forward limit, corresponding to the standard deep inelastic nuclear parton distributions, and first moment, giving the charge form factor of $^3He$. 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 when the asymmetry of the process is kept fixed, and they increase with the asymmetry at fixed momentum transfer. Another relevant 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 size of nuclear effects reaches 8 % even in the most important part of the kinematical range under scrutiny. The relevance of the obtained results to study the feasibility of experiments is addressed.
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"abstract": "A realistic microscopic calculation of the unpolarized quark Generalized\nParton Distribution (GPD) $H_q^3$ of the $^3He$ nucleus is presented. In\nImpulse Approximation, $H_q^3$ is obtained as a convolution between the GPD of\nthe internal nucleon and the non-diagonal spectral function, describing\nproperly Fermi motion and binding effects. The proposed scheme is valid at low\nvalues of $\\Delta^2$, the momentum transfer to the target, the most relevant\nkinematical region for the coherent channel of hard exclusive processes. The\nobtained formula has the correct forward limit, corresponding to the standard\ndeep inelastic nuclear parton distributions, and first moment, giving the\ncharge form factor of $^3He$. Nuclear effects, evaluated by a modern realistic\npotential, are found to be larger than in the forward case. In particular, they\nincrease with increasing the momentum transfer when the asymmetry of the\nprocess is kept fixed, and they increase with the asymmetry at fixed momentum\ntransfer. Another relevant feature of the obtained results is that the nuclear\nGPD cannot be factorized into a $\\Delta^2$-dependent and a\n$\\Delta^2$-independent term, as suggested in prescriptions proposed for finite\nnuclei. The size of nuclear effects reaches 8 % even in the most important part\nof the kinematical range under scrutiny. The relevance of the obtained results\nto study the feasibility of experiments is addressed.",
"arxiv_id": "nucl-th/0404014",
"authors": [
"Sergio Scopetta"
],
"categories": [
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"doi": "10.1103/PhysRevC.70.015205",
"journal_ref": "Phys.Rev. C70 (2004) 015205",
"title": "Generalized Parton Distributions of ^3He",
"url": "https://arxiv.org/abs/nucl-th/0404014"
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