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arXiv · 1202.2030

New insights into antikaon-nucleon scattering and the structure of the Lambda(1405)

Maxim Mai·Ulf-G. Meißner
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Abstract

We perform a combined analysis of antikaon-nucleon scattering cross sections and the recent SIDDHARTA kaonic hydrogen data in the framework of a coupled-channel Bethe-Salpeter approach at next-to-leading order in the chiral expansion of the effective potential. We find a precise description of the antikaon-proton scattering amplitudes and are able to extract accurate values of the scattering lengths, a0=-1.81^+0.30_-0.28 + i 0.92^+0.29_-0.23 fm, a1=+0.48^+0.12_-0.11 + i 0.87^+0.26_-0.20 fm. We also discuss the two-pole structure of the Lambda(1405).

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Maxim Mai, Ulf-G. Meißner. 2012-02-09. New insights into antikaon-nucleon scattering and the structure of the Lambda(1405). https://doi.org/10.1016/j.nuclphysa.2013.01.032

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