Abstract
The mass difference between the K + and K 0 mesons induces mixing of the a 00 (980) and f 0(980) resonances. The mixing amplitude is large, on the order of \(m(m_{K^0 }^2 - m_{K^ + }^2 )^{1/2} \approx \sqrt \alpha m_K^2 \) near the \(K\bar K\) thresholds, and its phase changes sharply by 90°. A high-energy experiment on the π− p→η π 0 n reaction in a polarized target is proposed. In this experiment, the presence of a 00 (980)−f 0(980) mixing can be unambiguously and simply identified by the presence of a large jump in the azimuthal asymmetry of the cross section for production of the ηπ0 system in the S wave near the \(K\bar K\) thresholds. Our estimates of the magnitude of the polarization effect, which is expected to be observed in the experiment, are almost model-independent.
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Translated from Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 79, No. 12, 2004, pp. 724–728.
Original Russian Text Copyright © 2004 by Achasov, Shestakov.