The Nature of the Λ(1405) from Photoproduction at SPring-8/LEPS

Jung Keun Ahn

doi:10.1016/j.nuclphysa.2010.01.211

The Nature of the Λ(1405) from Photoproduction at SPring-8/LEPS

Jung Keun Ahn

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The nature of Λ (1405) hyperon is yet unresolved for distinction among three-quark state, meson-baryon molecular state, or any other new form of hadronic matter. Recent theoretical works predict its lineshape to be different in terms of the πΣ isospin channels in the context of chiral dynamics. We have measured the lineshape of Λ (1405) in charged πΣ channels through p (γ, K⁺ π) Σ reaction at 1.5-2.4 GeV. The observed lineshapes are different in terms of π^- Σ⁺ and π⁺ Σ^- channels, and depends largely on the angular coverage for pions from the Λ (1405) decay. The cross section for Λ (1405) photoproduction integrated over the angular region 0.8 < cos θ_K+^* < 1.0 was found to be 0.43μb in the energy range from 1.5 to 2.0 GeV and 0.072μb in the energy range from 2.0 to 2.4 GeV.

Original language	English
Pages (from-to)	329-332
Number of pages	4
Journal	Nuclear Physics A
Volume	835
Issue number	1-4
DOIs	https://doi.org/10.1016/j.nuclphysa.2010.01.211
Publication status	Published - 2010 Apr 1
Externally published	Yes

Keywords

SPring-8
hyperons
photoproduction
Λ (1405)

ASJC Scopus subject areas

Nuclear and High Energy Physics

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title = "The Nature of the Λ(1405) from Photoproduction at SPring-8/LEPS",

abstract = "The nature of Λ (1405) hyperon is yet unresolved for distinction among three-quark state, meson-baryon molecular state, or any other new form of hadronic matter. Recent theoretical works predict its lineshape to be different in terms of the πΣ isospin channels in the context of chiral dynamics. We have measured the lineshape of Λ (1405) in charged πΣ channels through p (γ, K+ π) Σ reaction at 1.5-2.4 GeV. The observed lineshapes are different in terms of π- Σ+ and π+ Σ- channels, and depends largely on the angular coverage for pions from the Λ (1405) decay. The cross section for Λ (1405) photoproduction integrated over the angular region 0.8 < cos θK+* < 1.0 was found to be 0.43μb in the energy range from 1.5 to 2.0 GeV and 0.072μb in the energy range from 2.0 to 2.4 GeV.",

keywords = "SPring-8, hyperons, photoproduction, Λ (1405)",

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AU - Ahn, Jung Keun

PY - 2010/4/1

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N2 - The nature of Λ (1405) hyperon is yet unresolved for distinction among three-quark state, meson-baryon molecular state, or any other new form of hadronic matter. Recent theoretical works predict its lineshape to be different in terms of the πΣ isospin channels in the context of chiral dynamics. We have measured the lineshape of Λ (1405) in charged πΣ channels through p (γ, K+ π) Σ reaction at 1.5-2.4 GeV. The observed lineshapes are different in terms of π- Σ+ and π+ Σ- channels, and depends largely on the angular coverage for pions from the Λ (1405) decay. The cross section for Λ (1405) photoproduction integrated over the angular region 0.8 < cos θK+* < 1.0 was found to be 0.43μb in the energy range from 1.5 to 2.0 GeV and 0.072μb in the energy range from 2.0 to 2.4 GeV.

AB - The nature of Λ (1405) hyperon is yet unresolved for distinction among three-quark state, meson-baryon molecular state, or any other new form of hadronic matter. Recent theoretical works predict its lineshape to be different in terms of the πΣ isospin channels in the context of chiral dynamics. We have measured the lineshape of Λ (1405) in charged πΣ channels through p (γ, K+ π) Σ reaction at 1.5-2.4 GeV. The observed lineshapes are different in terms of π- Σ+ and π+ Σ- channels, and depends largely on the angular coverage for pions from the Λ (1405) decay. The cross section for Λ (1405) photoproduction integrated over the angular region 0.8 < cos θK+* < 1.0 was found to be 0.43μb in the energy range from 1.5 to 2.0 GeV and 0.072μb in the energy range from 2.0 to 2.4 GeV.

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KW - photoproduction

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