dorsal/arxiv
View SchemaThe role of $\Delta^{++*}(1620)$ resonances in $pp \to nK^+\Sigma^+$ reaction and its important implications
| Authors | J. J. Xie, B. S. Zou |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0701021 |
| URL | https://arxiv.org/abs/nucl-th/0701021 |
| DOI | 10.1016/j.physletb.2007.04.035 |
| Journal | Phys.Lett.B649:405-412,2007 |
Abstract
The $pp \to nK^+\Sigma^+$ reaction is a very good isospin 3/2 filter for studying $\Delta^{++*}$ decaying to $K^+\Sigma^+$. With an effective Lagrangian approach, contributions from a previous ignored sub-$K^+\Sigma^+$-threshold resonance $\Delta^{++*}(1620)1/2^-$ are fully included in addition to those already considered in previous calculations. It is found that the $\Delta^{++*}(1620)1/2^-$ resonance gives an overwhelmingly dominant contribution for energies very close to threshold, with a very important contribution from the t-channel $\rho$ exchange. This solves the problem that all previous calculations seriously underestimate the near-threshold cross section by order(s) of magnitude. Many important implications of the results are discussed.
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"abstract": "The $pp \\to nK^+\\Sigma^+$ reaction is a very good isospin 3/2 filter for\nstudying $\\Delta^{++*}$ decaying to $K^+\\Sigma^+$. With an effective Lagrangian\napproach, contributions from a previous ignored sub-$K^+\\Sigma^+$-threshold\nresonance $\\Delta^{++*}(1620)1/2^-$ are fully included in addition to those\nalready considered in previous calculations. It is found that the\n$\\Delta^{++*}(1620)1/2^-$ resonance gives an overwhelmingly dominant\ncontribution for energies very close to threshold, with a very important\ncontribution from the t-channel $\\rho$ exchange. This solves the problem that\nall previous calculations seriously underestimate the near-threshold cross\nsection by order(s) of magnitude. Many important implications of the results\nare discussed.",
"arxiv_id": "nucl-th/0701021",
"authors": [
"J. J. Xie",
"B. S. Zou"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/j.physletb.2007.04.035",
"journal_ref": "Phys.Lett.B649:405-412,2007",
"title": "The role of $\\Delta^{++*}(1620)$ resonances in $pp \\to nK^+\\Sigma^+$ reaction and its important implications",
"url": "https://arxiv.org/abs/nucl-th/0701021"
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