The mini-proceedings of the 17$^{mathrm{th}}$ Meeting of the Working Group on Radiative Corrections and MonteCarlo Generators for Low Energies held in Frascati, 20$^{mathrm{th}}$ - 21$^{mathrm{st}}$ April, are presented. These meetings, started in 20
06, have as aim to bring together experimentalists and theoreticians working in the fields of meson transition form factors, hadronic contributions to the anomalous magnetic moment of the leptons, and the effective fine structure constant. The development of MonteCarlo generators and Radiative Corrections for precision $e^+e^-$ and $tau$-lepton physics are also covered, with emphasis on meson production. Heavy quark masses were covered as well in this edition.
The current 3$sigma$ discrepancy between experiment and Standard Model predictions for $pi^0 to e^+e^-$ is reconsidered using the Pade Theory for bivariate functions, the Canterbury approximants. This method provides a model-independent data-driven a
pproximation to the decay as soon as experimental data for the doubly virtual $pi^0$ transition form factor are available. It also implements the correct QCD constraints of the form factor both at low- and high-energies. We reassess the Standard Model result including, for the first time, a systematic error. Our result, BR$(pi^0 to e^+e^-)=6.23(5)times 10^{-8}$, still represents a discrepancy larger than $2sigma$, unsurmountable with our present knowledge of the Standard Model, and would claim New Physics if the experimental result is confirmed by a new measurement. Our method also provides the adequate tool to extract the doubly virtual form factor from experimental data in a straightforward manner. This measurement would further shrink our error and establish once and for all the New Physics nature of the discrepancy. In addition, we remark the challenge this discrepancy poses in the evaluation of the hadronic light-by-light scattering contribution to the $(g-2)_{mu}$, specially confronted with the foreseen accuracy of the forthcoming $(g-2)_{mu}$ experiments.
The mini-proceedings of the 16th Meeting of the Working Group on Radiative Corrections and MonteCarlo Generators for Low Energies held in Frascati, 18th - 19th November, are presented. These meetings, started in 2006, have as aim to bring together ex
perimentalists and theoreticians working in the fields of meson transition form factors, hadronic contributions to the anomalous magnetic moment of the leptons, and the effective fine structure constant. The development of MonteCarlo generators and Radiative Corrections for precision $e^+e^-$ and tau-lepton physics are also covered.
We present the mini-proceedings of the workshops Hadronic contributions to the muon anomalous magnetic moment: strategies for improvements of the accuracy of the theoretical prediction and $(g-2)_{mu}$: Quo vadis?, both held in Mainz from April 1$^{r
m rst}$ to 5$^{rm th}$ and from April 7$^{rm th}$ to 10$^{rm th}$, 2014, respectively.
The mini-proceedings of the Light Meson Dynamics Workshop held in Mainz from February 10th to 12th, 2014, are presented. The web page of the conference, which contains all talks, can be found at https://indico.cern.ch/event/287442/overview .
The mini-proceedings of the MesonNet 2013 International Workshop held in Prague from June 17th to 19th, 2013, are presented. MesonNet is a research network within EU HadronPhysics3 project (1/2012 -- 12/2014). The web page of the conference, which co
ntains all talks, can be found at http://ipnp.mff.cuni.cz/mesonnet13
