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The available data (Dahl,et al., ref. (2) ; indicate that the φ has less than 20% polarization in our energy region. We can check this result, because we can calculate the angle0 e between the electrons in the φ rest system and the normal to the φ-production plane. Our distribution of0 e gives the maximum likelihood of zero polarization, well consistent with the above-mentioned data.
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Bollini, D., Buhler-Broglin, A., Dalpiaz, P. et al. Observation of the rare decay mode of the φ-meson: φ→e+e− . Nuovo Cimento A (1965-1970) 56, 1173–1184 (1968). https://doi.org/10.1007/BF02751636
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DOI: https://doi.org/10.1007/BF02751636