Riddle of the scalars: where is the sigma?
M. R. Pennington
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 ππ interactions below 1 GeV and its relation to the QCD vacuum can be clarified.
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