dorsal/arxiv
View SchemaStudy of the $\Sigma$(1385) and $\Lambda$(1405) resonances in K$^+$ photoproduction processes
| Authors | Madeleine Soyeur, Matthias F. M. Lutz |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0412027 |
| URL | https://arxiv.org/abs/nucl-th/0412027 |
| DOI | 10.1016/j.ppnp.2004.12.003 |
| Journal | Prog.Part.Nucl.Phys.55:165-173,2005 |
Abstract
The $\gamma p \to K^+ \pi^0 \Lambda$ and $\gamma p \to K^+ \pi \Sigma $ reactions are studied in the kinematic region where the $\pi^0 \Lambda$(1116) and $\pi\Sigma$(1192) pairs originate dominantly from the decay of the $\Sigma$(1385) and $\Lambda$(1405) resonances. We consider laboratory photon energies around 2 GeV, i.e. total center of mass energies above the known resonance region. We compute the t-channel kaon-exchange contribution to these reactions using $K^- p \to \pi^0 \Lambda$ and $K^- p \to \pi \Sigma$ amplitudes calculated in the framework of a chiral coupled-channel effective field theory of meson-baryon scattering. We extract from the calculated cross section the gauge-invariant double kaon pole term. We find this term to be large and likely to drive significantly the $\gamma p \to K^+ \pi^0 \Lambda$ and $\gamma p \to K^+ \pi \Sigma $ reactions in the kinematics under investigation. Accurate measurements of t-distributions for these processes, in progress or planned at ELSA and at SPring-8, are needed to confirm this expectation and assess the possibility of studying antikaon-nucleon dynamics just below threshold through these reactions.
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"abstract": "The $\\gamma p \\to K^+ \\pi^0 \\Lambda$ and $\\gamma p \\to K^+ \\pi \\Sigma $\nreactions are studied in the kinematic region where the $\\pi^0 \\Lambda$(1116)\nand $\\pi\\Sigma$(1192) pairs originate dominantly from the decay of the\n$\\Sigma$(1385) and $\\Lambda$(1405) resonances. We consider laboratory photon\nenergies around 2 GeV, i.e. total center of mass energies above the known\nresonance region. We compute the t-channel kaon-exchange contribution to these\nreactions using $K^- p \\to \\pi^0 \\Lambda$ and $K^- p \\to \\pi \\Sigma$ amplitudes\ncalculated in the framework of a chiral coupled-channel effective field theory\nof meson-baryon scattering. We extract from the calculated cross section the\ngauge-invariant double kaon pole term. We find this term to be large and likely\nto drive significantly the $\\gamma p \\to K^+ \\pi^0 \\Lambda$ and $\\gamma p \\to\nK^+ \\pi \\Sigma $ reactions in the kinematics under investigation. Accurate\nmeasurements of t-distributions for these processes, in progress or planned at\nELSA and at SPring-8, are needed to confirm this expectation and assess the\npossibility of studying antikaon-nucleon dynamics just below threshold through\nthese reactions.",
"arxiv_id": "nucl-th/0412027",
"authors": [
"Madeleine Soyeur",
"Matthias F. M. Lutz"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/j.ppnp.2004.12.003",
"journal_ref": "Prog.Part.Nucl.Phys.55:165-173,2005",
"title": "Study of the $\\Sigma$(1385) and $\\Lambda$(1405) resonances in K$^+$ photoproduction processes",
"url": "https://arxiv.org/abs/nucl-th/0412027"
},
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