How Universal Is the Coupling in the Sigma Model?

Denis Parganlija, Francesco Giacosa, Dirk H. Rischke, George Rupp, Eef van Beveren, Pedro Bicudo, Brigitte Hiller, Frieder Kleefeld
2008 AIP Conference Proceedings  
We calculate pion-pion scattering lengths and sigma, rho and a1 decay widths from a gauged linear sigma model with two flavours and its globally invariant generalisation.
doi:10.1063/1.2973492 fatcat:x5rchpvyqbcjboazofdle3vwqi