Evaluation of the pion-nucleon sigma term |
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| Authors: | YA Chao RE Cutkosky RL Kelly JW Alcock |
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| Institution: | Physics Department, Carnegie-Mellon University, Pittsburgh, Pa 15213, USA;Lawrence Berkeley Laboratory, Berkeley, Calif. 94720, USA;Bristol University, Bristol, England |
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| Abstract: | We have evaluated the σ-commutator term for πN scattering by using a new method to extrapolate the C(+) amplitude below threshold. Reproducing kernel techniques are used to extrapolate along hyperbolic curves whose lower branches lie within the physical region for energies above the elastic threshold. The value obtained is σNNππ = 57 ± 12 MeV. |
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