77 research outputs found
Pseudoscalar Transition Form Factors from Rational Approximants
The , , and transition form factors in the
space-like region are analyzed at low and intermediate energies in a
model-independent way through the use of rational approximants. Slope and
curvature parameters as well as their values at infinity are extracted from
experimental data. These results are suited for constraining hadronic models
such as the ones used for the hadronic light-by-light scattering piece of the
anomalous magnetic moment of the muon, and for the mixing parameters of the
system.Comment: Contribution to the 13th International Conference on Meson-Nucleon
Physics and the Structure of the Nucleon (MENU 2013), Rome, Italy, 30
September - October 4, 2013. 4 pages, 3 figures. v2: Reference adde
and transition form factors from Pad\'e approximants
We employ a systematic and model-independent method to extract, from space-
and time-like data, the and transition form factors (TFFs)
obtaining the most precise determination for their low-energy parameters and
discuss the impact on them. Using TFF
data alone, we also extract the mixing parameters, which are
compatible to those obtained from more sophisticated and input-demanding
procedures.Comment: 4 pages, 2 figures, presented at the 13th International Workshop on
Meson Production, Properties and Interaction (MESON 2014); added reference
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