The main message delivered by this MS is twofold: firstly, the
description of a semi-empirical method of the evaluation of survival
probabilities, and secondly, its application to the particularly
nontrivial case of broad resonances. A realistic parametrization of
pion–pion elastic scattering data is used to show that in the
traditional classification of the decay into exponential,
oscillatory transition and power-law regions the first two may even
be absent. This is the conclusion confirming the consistency of the
apparently controveresial assignment of this type of decay to the so
called $\sigma$ meson.


MR2718338 Kelkar, N. G.; Nowakowski, M. No classical limit of
quantum decay for broad states. J. Phys. A 43 (2010), no. 38,
385308, 9 pp. 81U05