dorsal/arxiv
View SchemaComparative Regge analysis of $\Lambda, \Sigma^0, \Lambda(1520)$ and $\Theta^+$ production in $\gamma p$, $\pi p$ and $pp$ reactions
| Authors | V. Yu. Grishina, L. A. Kondratyuk, W. Cassing, M. Mirazita, P. Rossi |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0506053 |
| URL | https://arxiv.org/abs/nucl-th/0506053 |
| DOI | 10.1140/epja/i2005-10081-7 |
| Journal | Eur.Phys.J. A25 (2005) 141-150 |
Abstract
Using the Quark-Gluon Strings Model -- combined with Regge phenomenology -- we perform a comparative analysis of $\Lambda$, $\Sigma^0$, $\Lambda(1520)$ and $\Theta^+$ production in binary reactions induced by photon, pion and proton beams on the nucleon. We find that the existing experimental data on the $\gamma p \to K^+ \Lambda$ differential and total cross sections can be described very well by the model for photon energies $1 - 16$ GeV and $-t < 2$ GeV$^2$ assuming a dominant contribution of the $K^*$ Regge trajectory. Moreover, using the same parameters we also reproduce the total $\gamma p \to K^+ \Sigma^0$ and $\gamma p \to K^+ \Lambda(1520)$ cross sections suggesting a 'universality' of the Regge model. In order to check the consistency of the approach we evaluate the differential and total cross sections for the reaction $\pi^- p \to K^0 \Lambda$ which is also found to be dominated by the $K^*$ Regge trajectory. Using the apparent 'universality' of the Regge model we extend our scheme to the analysis of the binary reactions $\gamma p \to \bar{K}^0 \Theta^+$, $\pi^- p \to K^- \Theta^+$ and $pp \to \Sigma^+ \Theta^+$ as well as the exclusive and inclusive $\Theta^+$ production in the reactions $pp \to p \bar{K}^0 \Theta^+$ and $pp \to \Theta^+ X$. Our detailed studies demonstrate that $\Theta^+$ production does not follow the 'universality' principle thus suggesting an essentially different internal structure of the exotic baryon relative to conventional hyperons or hyperon resonances.
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"abstract": "Using the Quark-Gluon Strings Model -- combined with Regge phenomenology --\nwe perform a comparative analysis of $\\Lambda$, $\\Sigma^0$, $\\Lambda(1520)$ and\n$\\Theta^+$ production in binary reactions induced by photon, pion and proton\nbeams on the nucleon. We find that the existing experimental data on the\n$\\gamma p \\to K^+ \\Lambda$ differential and total cross sections can be\ndescribed very well by the model for photon energies $1 - 16$ GeV and $-t \u003c 2$\nGeV$^2$ assuming a dominant contribution of the $K^*$ Regge trajectory.\nMoreover, using the same parameters we also reproduce the total $\\gamma p \\to\nK^+ \\Sigma^0$ and $\\gamma p \\to K^+ \\Lambda(1520)$ cross sections suggesting a\n\u0027universality\u0027 of the Regge model. In order to check the consistency of the\napproach we evaluate the differential and total cross sections for the reaction\n$\\pi^- p \\to K^0 \\Lambda$ which is also found to be dominated by the $K^*$\nRegge trajectory. Using the apparent \u0027universality\u0027 of the Regge model we\nextend our scheme to the analysis of the binary reactions $\\gamma p \\to\n\\bar{K}^0 \\Theta^+$, $\\pi^- p \\to K^- \\Theta^+$ and $pp \\to \\Sigma^+ \\Theta^+$\nas well as the exclusive and inclusive $\\Theta^+$ production in the reactions\n$pp \\to p \\bar{K}^0 \\Theta^+$ and $pp \\to \\Theta^+ X$. Our detailed studies\ndemonstrate that $\\Theta^+$ production does not follow the \u0027universality\u0027\nprinciple thus suggesting an essentially different internal structure of the\nexotic baryon relative to conventional hyperons or hyperon resonances.",
"arxiv_id": "nucl-th/0506053",
"authors": [
"V. Yu. Grishina",
"L. A. Kondratyuk",
"W. Cassing",
"M. Mirazita",
"P. Rossi"
],
"categories": [
"nucl-th"
],
"doi": "10.1140/epja/i2005-10081-7",
"journal_ref": "Eur.Phys.J. A25 (2005) 141-150",
"title": "Comparative Regge analysis of $\\Lambda, \\Sigma^0, \\Lambda(1520)$ and $\\Theta^+$ production in $\\gamma p$, $\\pi p$ and $pp$ reactions",
"url": "https://arxiv.org/abs/nucl-th/0506053"
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