A simple chiral antikaon-nucleon potential cannot simultaneously reproduce the Lambda(1405) pole position and the kaonic hydrogen level shift, and the author reads this as evidence for a single-pole Lambda(1405).
R´ evai, Are the chiral based ¯KN potentials really energy-dependent?, Few-Body Syst
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Lessons from fitting the lowest order energy independent chiral based $\bar{K}N$ potential to experimental data
A simple chiral antikaon-nucleon potential cannot simultaneously reproduce the Lambda(1405) pole position and the kaonic hydrogen level shift, and the author reads this as evidence for a single-pole Lambda(1405).