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${{\mathit \Lambda}{(1405)}}$ WIDTH

EXTRAPOLATIONS BELOW ${{\mathit N}}{{\overline{\mathit K}}}$ THRESHOLD

INSPIRE   PDGID:

B037W2

VALUE (MeV) DOCUMENT ID TECN  COMMENT • • We do not use the following data for averages, fits, limits, etc. • • $\text{50.24 or 50.26}$ 1 KIMURA 2000 potential model $30$ 2 MARTIN 1981 K-matrix fit $55$ 3, 4 CHAO 1973 DPWA 0$-$range fit (sol. B) $20$ MARTIN 1970 RVUE Constant K-matrix $29$ $\pm6$ MARTIN 1969 HBC Constant K-matrix $50$ $\pm5$ KIM 1967 HBC K-matrix fit $34.1$ $\pm4.1$ 5 KITTEL 1966 HBC $37.0$ $\pm3.2$ KIM 1965 HBC $28.2$ $\pm4.1$ 5 SAKITT 1965 HBC 1  The KIMURA 2000 values are from fits A and B from a coupled-channel potential model using low-energy ${{\overline{\mathit K}}}{{\mathit N}}$ and ${{\mathit \Sigma}}{{\mathit \pi}}$ data, kaonic-hydrogen x-ray measurements, and our ${{\mathit \Lambda}{(1405)}}$ mass and width. The results bear mainly on the $\mathit nature$ of the ${{\mathit \Lambda}{(1405)}}$: three-quark state or ${{\overline{\mathit K}}}{{\mathit N}}$ bound state. 2  The MARTIN 1981 fit includes the ${{\mathit K}^{\pm}}{{\mathit p}}$ forward scattering amplitudes and the dispersion relations they must satisfy. 3  An asymmetric shape, with $\Gamma $/2 = 41 MeV below resonance, 14 MeV above. 4  See also the accompanying paper of THOMAS 1973. 5  Data of SAKITT 1965 are used in the fit by KITTEL 1966.

References

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