The Ξ(1620) spectrum in Ξ_c → ππΞ decay shifts below the pole position, and the peak-to-cusp transition tracks the sign of the real part of the ¯KΛ scattering length.
Sumihamaet al., Phys
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Effect of eigenstates on spectra in coupled-channel scattering with the chiral unitary model
The Ξ(1620) spectrum in Ξ_c → ππΞ decay shifts below the pole position, and the peak-to-cusp transition tracks the sign of the real part of the ¯KΛ scattering length.