K- d → πΣn reactions and structure of the Λ(1405)

S. Ohnishi, Y. Ikeda, T. Hyodo, Emiko Hiyama, W. Weise

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

We report on the first results of a full three-body calculation of the NN-πYN amplitude for the K-d → πΣn reaction, and examine how the Λ(1405) resonance manifests itself in the neutron energy distributions of K-d → πΣn reactions. The amplitudes are computed using the NN-πYN coupled-channels Alt-Grassberger-Sandhas (AGS) equations. Two types of models are considered for the two-body meson-baryon interactions: an energy-independent interaction and an energy-dependent one, both derived from the leading order chiral SU(3) Lagrangian. These two models have different off-shell properties that cause correspondingly different behaviors in the three-body system. As a remarkable result of this investigation, it is found that the neutron energy spectrum, reflecting the A(1405) mass distribution and width, depends quite sensitively on the (energy-dependent or energy-independent) model used. Hence accurate measurements of the πΣ mass distribution have the potential to discriminate between possible mechanisms at work in the formation of the Λ(1405).

Original languageEnglish
Article number012077
JournalJournal of Physics: Conference Series
Volume569
Issue number1
DOIs
Publication statusPublished - Jan 1 2014
Event3rd International Workshop on State of the Art in Nuclear Cluster Physics, SOTANCP 2014 - Yokohama, Japan
Duration: May 26 2014May 30 2014

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mass distribution
energy
neutron spectra
baryons
energy distribution
energy spectra
mesons
interactions
neutrons
causes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

K- d → πΣn reactions and structure of the Λ(1405). / Ohnishi, S.; Ikeda, Y.; Hyodo, T.; Hiyama, Emiko; Weise, W.

In: Journal of Physics: Conference Series, Vol. 569, No. 1, 012077, 01.01.2014.

Research output: Contribution to journalConference article

Ohnishi, S. ; Ikeda, Y. ; Hyodo, T. ; Hiyama, Emiko ; Weise, W. / K- d → πΣn reactions and structure of the Λ(1405). In: Journal of Physics: Conference Series. 2014 ; Vol. 569, No. 1.
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abstract = "We report on the first results of a full three-body calculation of the NN-πYN amplitude for the K-d → πΣn reaction, and examine how the Λ(1405) resonance manifests itself in the neutron energy distributions of K-d → πΣn reactions. The amplitudes are computed using the NN-πYN coupled-channels Alt-Grassberger-Sandhas (AGS) equations. Two types of models are considered for the two-body meson-baryon interactions: an energy-independent interaction and an energy-dependent one, both derived from the leading order chiral SU(3) Lagrangian. These two models have different off-shell properties that cause correspondingly different behaviors in the three-body system. As a remarkable result of this investigation, it is found that the neutron energy spectrum, reflecting the A(1405) mass distribution and width, depends quite sensitively on the (energy-dependent or energy-independent) model used. Hence accurate measurements of the πΣ mass distribution have the potential to discriminate between possible mechanisms at work in the formation of the Λ(1405).",
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N2 - We report on the first results of a full three-body calculation of the NN-πYN amplitude for the K-d → πΣn reaction, and examine how the Λ(1405) resonance manifests itself in the neutron energy distributions of K-d → πΣn reactions. The amplitudes are computed using the NN-πYN coupled-channels Alt-Grassberger-Sandhas (AGS) equations. Two types of models are considered for the two-body meson-baryon interactions: an energy-independent interaction and an energy-dependent one, both derived from the leading order chiral SU(3) Lagrangian. These two models have different off-shell properties that cause correspondingly different behaviors in the three-body system. As a remarkable result of this investigation, it is found that the neutron energy spectrum, reflecting the A(1405) mass distribution and width, depends quite sensitively on the (energy-dependent or energy-independent) model used. Hence accurate measurements of the πΣ mass distribution have the potential to discriminate between possible mechanisms at work in the formation of the Λ(1405).

AB - We report on the first results of a full three-body calculation of the NN-πYN amplitude for the K-d → πΣn reaction, and examine how the Λ(1405) resonance manifests itself in the neutron energy distributions of K-d → πΣn reactions. The amplitudes are computed using the NN-πYN coupled-channels Alt-Grassberger-Sandhas (AGS) equations. Two types of models are considered for the two-body meson-baryon interactions: an energy-independent interaction and an energy-dependent one, both derived from the leading order chiral SU(3) Lagrangian. These two models have different off-shell properties that cause correspondingly different behaviors in the three-body system. As a remarkable result of this investigation, it is found that the neutron energy spectrum, reflecting the A(1405) mass distribution and width, depends quite sensitively on the (energy-dependent or energy-independent) model used. Hence accurate measurements of the πΣ mass distribution have the potential to discriminate between possible mechanisms at work in the formation of the Λ(1405).

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