In memory of Paco Yndurain: A precise determination of pion-pion   scattering from experiment and dispersion relations
  This talk is dedicated to the memory of Paco Yndurain, the original speaker in the conference. After a short account of his scientific career, we briefly review our ongoing collaboration to determine precisely the $\pi\pi$ scattering amplitude including the most recent data by means of Forward Dispersion Relations and Roy Equations. A remarkable improvement in precision over the intermediate energy region is obtained by using once-subtracted Roy Equations in addition to the standard twice-subtracted ones. 
J. R. Pelaez, R. Garcia-Martin, R. Kaminski, F. J. Yndurain