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.
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