1999/05/04 by M. R. Pennington, Pennington, M. R.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9905241
20 pages, 12 figures Talk at the Workshop on Hadron Spectroscopy, WHS99, Frascati, March 1999. Revised version has the word "triangles" replaced by "circles"!
arxiv created 1999/05/13 · arxiv updated 2009/11/30
The riddle of the sigma is recast in a way that tries to differentiate fact from fiction as a basis for future/further discussion. By doing this, it is hoped that the role of the sigma as dominating the ubiquitous ππ interactions below 1 GeV and its relation to the QCD vacuum can be clarified.