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Journal Articles Physical Review C Year : 2001

$\pi\Lambda\Sigma$ Coupling Extracted from Hyperonic Atoms


The latest measurements of the atomic level width in Sigma-hyperonic Pb atom offer the most accurate datum in the region of low-energy Sigma-hyperon physics. Atomic widths are due to the conversion of Sigma-nucleon into Lambda-nucleon. In high angular momentum states this conversion is dominated by the one-pion exchange. A joint analysis of the data of the scattering of negative-Sigma on proton converting into a Lambda and a neutron and of the atomic widths allows to extract a pseudovector pion-hyperon-Sigma coupling constant of 0.048 with a statistical error of +-0.005 and a systematic one of +-0.004. This corresponds to a pseudoscalar coupling constant of 13.3 with a statistical uncertainty of 1.4 and a systematic one of 1.1.

Dates and versions

in2p3-00087223 , version 1 (21-07-2006)



B. Loiseau, S. Wycech. $\pi\Lambda\Sigma$ Coupling Extracted from Hyperonic Atoms. Physical Review C, 2001, 63, pp.034003. ⟨in2p3-00087223⟩
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