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

Abstract : 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.
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Submitted on : Friday, July 21, 2006 - 3:34:27 PM
Last modification on : Tuesday, January 25, 2022 - 12:48:11 PM

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

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