| THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS |
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Influence of the Choice of $NN$ Potential Model on $\gamma d\to\pi^0d$ Observables near $\eta$-Threshold |
| E. M. Darwish1,2** |
1Physics Department, Faculty of Science, Taibah University, Madinah 41477, Saudi Arabia
2Physics Department, Faculty of Science, Sohag University, Sohag 82524, Egypt
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| Cite this article: |
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E. M. Darwish 2016 Chin. Phys. Lett. 33 041301 |
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Abstract Influence of the choice of the $NN$ potential model governing the deuteron wave function on the observables for coherent $\pi^0$-photoproduction on the deuteron near $\eta$-threshold is investigated by using a three-body model for the intermediate $\eta NN$ system with separable two-body interactions. Results for unpolarized differential cross section and polarization observables are predicted. It is revealed that the choice of the $NN$ potential model has a visible effect on the differential cross section and most of the polarization observables, especially in the photon energy range of 600–800 MeV and extreme backward pion angles. We find that the deviation among results obtained by using different deuteron wave functions is quite large. The use of the CD-Bonn $NN$ potential for deuteron wave function doubles the differential cross section in this kinematic region. Compared with the experimental data from CLAS collaboration for differential cross section, sizeable discrepancies are found.
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Received: 28 December 2015
Published: 29 April 2016
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