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# The chiral representation of the $\pi N$ scattering amplitude and the pion-nucleon sigma term

PHYSICAL REVIEW D, no. 5 (2012)

We present a novel analysis of the pi N scattering amplitude in Lorentz covariant baryon chiral perturbation theory renormalized in the extended-on-mass-shell scheme. This amplitude, valid up to O(p(3)) in the chiral expansion, systematically includes the effects of the Delta (1232) in the delta-counting, has the right analytic properties...更多

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