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Towards an understanding of isospin violation in pion-nucleon scattering
Nadia Fettes, Ulf-G. Meißner
We investigate isospin breaking in low-energy pion-nucleon scattering in the framework of chiral perturbation theory. This work extends the systematic analysis of [1] to the energy…
Pion-nucleon scattering in an effective chiral field theory with explicit spin-3/2 fields
Nadia Fettes, Ulf-G. Meißner
We analyze elastic-pion nucleon scattering to third order in the so-called small scale expansion. It is based on an effective Lagrangian including pions, nucleons and deltas as act…
Pion-nucleon scattering in chiral perturbation theory II: Fourth order calculation
Nadia Fettes, Ulf-G. Meißner
We analyse elastic-pion nucleon scattering to fourth order in heavy baryon chiral perturbation theory, extending the third order study published in Nucl. Phys. A640 (1998) 199. We…
The chiral effective pion-nucleon Lagrangian of order p^4
Nadia Fettes, Ulf-G. Meißner, Martin Mojzis +1
We construct the minimal effective chiral pion-nucleon SU(2) Lagrangian at fourth order in the chiral expansion. The Lagrangian contains 118 in principle measurable terms. We devel…