Riddle of the scalars: where is the sigma?

Abstract

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 $\pi \pi$ interactions below 1 GeV and its relation to the QCD vacuum can be clarified.

arXiv comment20 pages, 12 figures Talk at the Workshop on Hadron Spectroscopy, WHS99, Frascati, March 1999. Revised version has the word "triangles" replaced by "circles"!

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