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Pion–nucleon scattering in chiral perturbation theory II: Fourth order calculation

✍ Scribed by Nadia Fettes; Ulf-G. Meißner

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
326 KB
Volume
676
Category
Article
ISSN
0375-9474

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✦ Synopsis

We analyze elastic pion-nucleon scattering to fourth order in heavy-baryon chiral perturbation theory, extending the third-order study published in Nucl. Phys. A 640 (1998) 199. We use various partial-wave analyses to pin down the low-energy constants from data in the physical region. The S-wave scattering lengths are consistent with recent determinations from pionic hydrogen and deuterium. We find an improved description of the P-waves. We also discuss the pion-nucleon sigma term and problems related to the prediction of the subthreshold parameters.

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