Sergi Gonzalez-Solis: Phenomenological applications of rational approximants
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Europe/Madrid
Seminar (IFAE)
Seminar
IFAE
Jelena Aleksic
(IFAE), Joern Lange
(IFAE Barcelona), Stefania Bordoni
(IFAE)
Description
In this talk I will first give a brief introduction to the Padé Approximants (PAs) method. PAs are rational functions of a polynomial of order N over a polynomial of order M, constructed in such a manner that they have the same Taylor expansion as the function to be approximated up to order N+M+1. These approximants are known to have better convergence properties than a Taylor expansion, property that I will exploit to parameterize physical observables which are difficult to describe from first principles. In particular, I will tackle gamma-gamma-meson vertex applied to both the space-and time-like energy regions.