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Structure of Lambda(1405) and threshold behavior of piSigma scattering

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arxiv 1101.5190 v2 pith:PURVETP5 submitted 2011-01-27 nucl-th

Yoichi Ikeda , Tetsuo Hyodo , Daisuke Jido , Hiroyuki Kamano , Toru Sato , Koichi Yazaki This is my paper
classification nucl-th
keywords thresholdlambdapisigmascatteringkbarnresonancestructureamplitude
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The scattering length and effective range of the piSigma channel are studied in order to characterize the strangeness S=-1 meson-baryon scattering and the Lambda(1405) resonance. We examine various off-shell dependence of the amplitude in dynamical chiral models to evaluate the threshold quantities with the constraint at the KbarN threshold. We find that the piSigma threshold parameters are important to the structure of the Lambda(1405) resonance and provide further constraints on the subthreshold extrapolation of the KbarN interaction.

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  1. Eigenstates in coupled-channel scattering amplitude and their effects on spectrum

    hep-ph 2025-06 conditional novelty 6.0 of 10

    In coupled-channel scattering, the observable above-threshold resonance originates from the virtual-state pole, while the subthreshold quasibound state becomes a shadow pole, an interchange shown and applied to Xi resonances.

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