dorsal/arxiv
View SchemaRole of nucleon resonance excitation in $\phi$ meson photoproduction
| Authors | Q. Zhao, J. -P. Didelez, M. Guidal, B. Saghai |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9909059 |
| URL | https://arxiv.org/abs/nucl-th/9909059 |
Abstract
The resonance effects are investigated in the $\phi$ meson photoproduction near threshold through a quark model approach with an effective Lagrangian. The diffractive contribution is consistently estimated by the {\it t}-channel Pomeron exchange. Another non-diffractive process, {\it t}-channel $\pi^0$ exchange is also included. The numerical result shows that the Pomeron exchange plays dominant role in the $\phi$ meson photoproduction, while the cross sections of the non-diffractive processes, i.e. {\it s}- and {\it u}-channel excitations, and {\it t}-channel $\pi^0$ exchange, are quite small. In the polarization observables, we find that large asymmetries are produced in the backward direction by the interferences from the {\it s}- and {\it u}-channel resonances, while in the forward direction, only very small asymmetries are generated. Meanwhile, we find that the effects from the $\pi^0$ exchange are generally negligible.
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"abstract": "The resonance effects are investigated in the $\\phi$ meson photoproduction\nnear threshold through a quark model approach with an effective Lagrangian. The\ndiffractive contribution is consistently estimated by the {\\it t}-channel\nPomeron exchange. Another non-diffractive process, {\\it t}-channel $\\pi^0$\nexchange is also included. The numerical result shows that the Pomeron exchange\nplays dominant role in the $\\phi$ meson photoproduction, while the cross\nsections of the non-diffractive processes, i.e. {\\it s}- and {\\it u}-channel\nexcitations, and {\\it t}-channel $\\pi^0$ exchange, are quite small. In the\npolarization observables, we find that large asymmetries are produced in the\nbackward direction by the interferences from the {\\it s}- and {\\it u}-channel\nresonances, while in the forward direction, only very small asymmetries are\ngenerated. Meanwhile, we find that the effects from the $\\pi^0$ exchange are\ngenerally negligible.",
"arxiv_id": "nucl-th/9909059",
"authors": [
"Q. Zhao",
"J. -P. Didelez",
"M. Guidal",
"B. Saghai"
],
"categories": [
"nucl-th"
],
"title": "Role of nucleon resonance excitation in $\\phi$ meson photoproduction",
"url": "https://arxiv.org/abs/nucl-th/9909059"
},
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"type": "Model",
"variant": "snapshot-2026-03-01",
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