Hyperon III: $$K^{-}p - \pi \varSigma $$ coupled-channel dynamics in the $$\varLambda (1405)$$ mass region

Anisovich, A. V.; Sarantsev, A. V.; Nikonov, V. A.; Burkert, V.; Schumacher, R. A.; Thoma, U.; Klempt, E.

doi:10.1140/epja/s10050-020-00142-8

Hyperon III: $$$$K^{-}p - \pi \varSigma $$$$ coupled-channel dynamics in the $$$$\varLambda (1405)$$$$ mass region

Journal Article · Tue May 19 00:00:00 EDT 2020 · European Physical Journal. A

DOI:https://doi.org/10.1140/epja/s10050-020-00142-8· OSTI ID:1783419

Anisovich, A. V.; Sarantsev, A. V.; Nikonov, V. A.; Burkert, V.; Schumacher, R. A.; Thoma, U.; Klempt, E.

Abstract

Low-energy data on the three charge states in $$$$\gamma p \rightarrow K^+(\varSigma \pi )$$$$ $γ p \to K^{+} (Σ π)$ from CLAS at JLab, on $$$$K^-p\rightarrow \pi ^0\pi ^0\varLambda $$$$ $K^{-} p \to π^{0} π^{0} Λ$ and $$$$\pi ^0\pi ^0\varSigma $$$$ $π^{0} π^{0} Σ$ from the Crystal Ball at BNL, bubble chamber data on $$$$K^-p\rightarrow \pi ^-\pi ^+\pi ^{\pm }\varSigma ^{\mp }$$$$ $K^{-} p \to π^{-} π^{+} π^{\pm} Σ^{\mp}$ , low-energy total cross sections on $$K^-$$ $K^{-}$ induced reactions, and data on the $$K^-p$$ $K^{-} p$ atom are fitted with the BnGa partial-wave-analysis program. We find that the data can be fitted well with just one isoscalar spin-1/2 negative-parity pole, the $$$$\varLambda (1405)$$$$ $Λ (1405)$ , and background contributions. In a fit with one isocsalar state, the $$$$\varLambda (1405)$$$$ $Λ (1405)$ structure can be determined as a dominantly SU(3) singlet state. A fit with two isoscalar singlet states, with imposed properties of the low-mass state, is, however, also not incompatible with data.

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Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177; FG02-87ER40315

OSTI ID:: 1783419

Alternate ID(s):: OSTI ID: 1646614
OSTI ID: 22907127

Report Number(s):: DOE/OR--23177-5019; JLAB-PHY--20-3218; 139; PII: 142

Journal Information:: European Physical Journal. A, Journal Name: European Physical Journal. A Journal Issue: 5 Vol. 56; ISSN 1434-6001

Publisher:: Springer Science + Business MediaCopyright Statement

Country of Publication:: Germany

Language:: English

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