Low Energy Experiments on pi-pi Scattering

Details Low Energy Experiments on pi-pi Scattering Low Energy Experiments on pi-pi Scattering

1998-01-21

arxiv.org/abs/hep-ph/9801366v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given by D. Pocanic at Workshop on Chiral Dynamics: Theory and Experiment (ChPT 97), Mainz, Germany, 1-5 Sep 1997; 16 pag

Scientific paper

10.1007/BFb0104915

General interest in a precise determination of the threshold pi-pi amplitudes has recently increased markedly due to a controversy regarding the size of <0|qbar q|0>, the scalar quark condensate. This paper examines the current experimental information on the pi-pi scattering lengths, in particular the recent low energy pi N -> pi pi N data from several laboratories and the related application of the Chew-Low-Goebel technique well below 1 GeV/c momentum. It appears that uncertainties related to the treatment of non-pion-exchange backgrounds in these studies do not yet allow an unambiguous resolution of the <0|qbar q|0> size. However, near-term prospects for new model-independent results of improved precision are very good.

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