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[en] Full description of the whole structure and of the operation of every routine is given for both programs, as well as the data setup in punched cards and binary tape. To help the users we present and comment several examples of data sets and the corresponding output plots. The list of instructions in FORTRAN IV language is included. The same version of both programs is operative in the series 7090-94-IBM and 1106-08-UNIVAC. (Author)
[en] In light of recent experimental results, we revisit the dispersive analysis of the ω→3π decay amplitude and of the ωπ transition form factor. Within the framework of the Khuri–Treiman equations, we show that the ω→3π Dalitz-plot parameters obtained with a once-subtracted amplitude are in agreement with the latest experimental determination by BESIII. Furthermore, we show that at low energies the ωπ transition form factor obtained from our determination of the ω→3π amplitude is consistent with the data from MAMI and NA60 experiments.
[en] Model complexity in amplitude analyses is often a priori under-constrained since the underlying theory permits a large number of possible amplitudes to contribute to most physical processes. The use of an overly complex model results in reduced predictive power and worse resolution on unknown parameters of interest. Therefore, it is common to reduce the complexity by removing from consideration some subset of the allowed amplitudes. This paper studies a method for limiting model complexity from the data sample itself through regularization during regression in the context of a multivariate (Dalitz-plot) analysis. The regularization technique applied greatly improves the performance. An outline of how to obtain the significance of a resonance in a multivariate amplitude analysis is also provided
[en] The paper discusses the parity of the neutral pion. It is shown that the recent determination of the parity of the neutral pion using the double Dalitz decay π0→e+e-e+e- is compatible with the mixed-parity nature of the neutral pion predicted by a recent composite model. (author)
[en] The energy derivatives of probabilities are functions suited to a best understanding of certain mechanisms. Applied to compound nuclear reactions, they can bring information on fusion barrier distributions as originally introduced, and also, as presented here, on fission barrier distributions and heights. Extendedly, they permit to access the compound nucleus spin-parity states preferentially populated according to an entrance channel, at a given energy. (authors)