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6. 11. 2012.
Evaluation of the Pion-Nucleon Sigma Term from CHAOS Data
Abstract We have reanalyzed the π ± p scattering data at low energy in the Coulomb-nuclear interference region as measured by the CHAOS group at TRIUMF with the aim to determine the pion–nucleon σ term. The resulting value σ = ( 44 ± 12 ) MeV , while in agreement with lattice QCD calculations and compatible with other recent analyses, is significantly lower than that from the GWU–TRIUMF analysis of 2002.