dorsal/arxiv
View SchemaNear-threshold $\omega$ and $\phi$ meson productions in $pp$ collisions
| Authors | K. Tsushima, K. Nakayama |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0304017 |
| URL | https://arxiv.org/abs/nucl-th/0304017 |
| DOI | 10.1103/PhysRevC.68.034612 |
| Journal | Phys.Rev. C68 (2003) 034612 |
Abstract
Using a relativistic effective Lagrangian at the hadronic level, near-threshold $\omega$ and $\phi$ meson productions in proton proton ($pp$) collisions, $p p \to p p \omega/\phi$, are studied within the distorted wave Born approximation. Both initial and final state $pp$ interactions are included. In addition to total cross section data, both $\omega$ and $\phi$ angular distribution data are used to constrain further the model parameters. For the $p p \to p p \omega$ reaction we consider two different possibilities: with and without the inclusion of nucleon resonances. The nucleon resonances are included in a way to be consistent with the $\pi^- p \to \omega n$ reaction. It is shown that the inclusion of nucleon resonances can describe the data better overall than without their inclusion. However, the SATURNE data in the range of excess energies $Q < 31$ MeV are still underestimated by about a factor of two. As for the $p p \to p p \phi$ reaction it is found that the presently limited available data from DISTO can be reproduced by four sets of values for the vector and tensor $\phi NN$ coupling constants. Further measurements of the energy dependence of the total cross section near threshold energies should help to constrain better the $\phi NN$ coupling constant.
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"abstract": "Using a relativistic effective Lagrangian at the hadronic level,\nnear-threshold $\\omega$ and $\\phi$ meson productions in proton proton ($pp$)\ncollisions, $p p \\to p p \\omega/\\phi$, are studied within the distorted wave\nBorn approximation. Both initial and final state $pp$ interactions are\nincluded. In addition to total cross section data, both $\\omega$ and $\\phi$\nangular distribution data are used to constrain further the model parameters.\nFor the $p p \\to p p \\omega$ reaction we consider two different possibilities:\nwith and without the inclusion of nucleon resonances. The nucleon resonances\nare included in a way to be consistent with the $\\pi^- p \\to \\omega n$\nreaction. It is shown that the inclusion of nucleon resonances can describe the\ndata better overall than without their inclusion. However, the SATURNE data in\nthe range of excess energies $Q \u003c 31$ MeV are still underestimated by about a\nfactor of two. As for the $p p \\to p p \\phi$ reaction it is found that the\npresently limited available data from DISTO can be reproduced by four sets of\nvalues for the vector and tensor $\\phi NN$ coupling constants. Further\nmeasurements of the energy dependence of the total cross section near threshold\nenergies should help to constrain better the $\\phi NN$ coupling constant.",
"arxiv_id": "nucl-th/0304017",
"authors": [
"K. Tsushima",
"K. Nakayama"
],
"categories": [
"nucl-th",
"hep-ph",
"nucl-ex"
],
"doi": "10.1103/PhysRevC.68.034612",
"journal_ref": "Phys.Rev. C68 (2003) 034612",
"title": "Near-threshold $\\omega$ and $\\phi$ meson productions in $pp$ collisions",
"url": "https://arxiv.org/abs/nucl-th/0304017"
},
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