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We consider the phenomenological description of the two pion invariant massspectrum in the $V' \to V \pi\pi$ decays. We study the parametrization of theamplitude involving both $S$ and $D$ wave contributions. From a fit to the twopion decays of the $ \Upsilon(nS)$ and $\Psi(nS)$ we determine the $f_0 (600)$mass and width to be $m_{f_0}=528 \pm 32$ MeV and $\Gamma_{f_0}=413\pm 45$ MeV.The mass and width values we report correspond to the real and imaginary partof the S matrix pole respectively.Comment: 19 pages, 3 figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>π</mml:mi><mml:mi>π</mml:mi></mml:math>invariant mass spectrum in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>V</mml:mi></mml:mrow><mml:mrow><mml:mo>′</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mo>→</mml:mo><mml:mi>V</mml:mi><mml:mi>π</mml:mi><mml:mi>π</mml:mi></mml:math>and the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="…

ππinvariant mass spectrum inV′→Vππand the