dorsal/arxiv
View SchemaNN Final-State Interaction in the Helicity Dependence of Inclusive $\pi^-$ Photoproduction from the Deuteron
| Authors | Eed M. Darwish |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0505001 |
| URL | https://arxiv.org/abs/nucl-th/0505001 |
| DOI | 10.1143/PTP.113.169 |
| Journal | Prog.Theor.Phys. 113 (2005) 169-181 |
Abstract
The helicity dependence of the inclusive $\pi^-$ photoproduction reaction from the deuteron in the $\Delta$(1232)-resonance region is investigated with inclusion of final-state nucleon-nucleon rescattering ($NN$-FSI). For the elementary $\pi$-production operator an effective Lagrangian model which includes the standard pseudovector Born terms and a contribution from the $\Delta$-resonance is used. The half-off-shell $NN$-scattering matrix is obtained from a separable representation of a realistic $NN$-interaction. The differential polarized cross-section difference for parallel and antiparallel helicity states is predicted and compared with experiment. We find that the effect of $NN$-FSI is much less important in the helicity difference than in the previously studied unpolarized differential cross section. Furthermore, the contribution of $\vec d(\vec\gamma,\pi^-)pp$ to the deuteron spin asymmetry is explicitly evaluated with inclusion of $NN$-FSI. It has been found that the effect of $NN$-FSI is much larger in the asymmetry than in the total cross section, and this leads to an appreciable reduction of the spin asymmetry in the $\Delta$-region. Inclusion of such effect also leads to improved and quite satisfactory agreement with existing experimental data.
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"abstract": "The helicity dependence of the inclusive $\\pi^-$ photoproduction reaction\nfrom the deuteron in the $\\Delta$(1232)-resonance region is investigated with\ninclusion of final-state nucleon-nucleon rescattering ($NN$-FSI). For the\nelementary $\\pi$-production operator an effective Lagrangian model which\nincludes the standard pseudovector Born terms and a contribution from the\n$\\Delta$-resonance is used. The half-off-shell $NN$-scattering matrix is\nobtained from a separable representation of a realistic $NN$-interaction. The\ndifferential polarized cross-section difference for parallel and antiparallel\nhelicity states is predicted and compared with experiment. We find that the\neffect of $NN$-FSI is much less important in the helicity difference than in\nthe previously studied unpolarized differential cross section. Furthermore, the\ncontribution of $\\vec d(\\vec\\gamma,\\pi^-)pp$ to the deuteron spin asymmetry is\nexplicitly evaluated with inclusion of $NN$-FSI. It has been found that the\neffect of $NN$-FSI is much larger in the asymmetry than in the total cross\nsection, and this leads to an appreciable reduction of the spin asymmetry in\nthe $\\Delta$-region. Inclusion of such effect also leads to improved and quite\nsatisfactory agreement with existing experimental data.",
"arxiv_id": "nucl-th/0505001",
"authors": [
"Eed M. Darwish"
],
"categories": [
"nucl-th"
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"doi": "10.1143/PTP.113.169",
"journal_ref": "Prog.Theor.Phys. 113 (2005) 169-181",
"title": "NN Final-State Interaction in the Helicity Dependence of Inclusive $\\pi^-$ Photoproduction from the Deuteron",
"url": "https://arxiv.org/abs/nucl-th/0505001"
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