The Nucleon Sigma Term from the GW πN Partial Wave and Dispersion Relation Analysis
Abstract
The pion-nucleon sigma term (∑) remains an enigma in our quest to understand the chiral dynamics of low energy QCD. The last comprehensive study of the extraction of ∑ from πp elastic scattering data was done by the Karlsruhe group 1,2 based on a partial-wave analysis solution of pre-1980 data, KH80 3. Later work 5 presented (in our opinion) an alternate method of extracting ∑ from the same solution. Our most recent efforts have focused on extracting a new and reliable value for the ∑ from the most up-to-date πN data, constantly updated in the SAID database4 ...
- Publication:
-
Chiral Dynamics. Theory and Experiment III
- Pub Date:
- December 2001
- DOI:
- 10.1142/9789812810977_0053
- Bibcode:
- 2001chdy.conf..348P