Elastic 
N scattering to 
in heavy baryon chiral
perturbation theory
Martin Mojzis
Department of Theoretical Physics, Comenius University, Mlynska dolina, SK-84215 Bratislava, Slovakia (e-mail: mojzis@fmph.uniba.sk)
Received: 29 April 1997
Abstract
The elastic 
N scattering amplitude in the isospin limit is calculated
in the framework of heavy baryon chiral perturbation theory, up to the third
order. Threshold parameters like scattering lengths, volumes, effective
ranges, etc. are compared with data. All relevant low energy constants are
fixed from the available pion-nucleon data. A clear improvement in the
description of data is observed, when going from the first two orders in the
chiral expansion to the third one. The importance of even higher orders is
suggested by the results.
Copyright Springer-Verlag
