Evaluation of the Pion-Nucleon Sigma Term from CHAOS Data

We have reanalyzed the $π^{\pm} p$ 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 $σ=(44\pm 12)$ 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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