Current algebra, $π π$ scattering lengths, and the $S^{*} (980)$ background contribution

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1 June 1982

journal article
research article
Published by American Physical Society (APS) in Physical Review D

Vol. 25 (11) , 3073-3074
https://doi.org/10.1103/physrevd.25.3073

Abstract

We demonstrate that the recently measured

S^{*} (980) \to π π

decay width implies an

S^{*}

background contribution in addition to the Weinberg low-energy

π π

amplitude which significantly improves the agreement between the current-algebra theory for

π π

scattering lengths and experiment.

Keywords

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