4 papers
hep-ph2001
Pion-nucleon sigma-term - a review
M. E. Sainio
A brief review of the pion-nucleon sigma-term is given. Aspects of both chiral perturbation theory and phenomenology are discussed.
hep-ph2001
Resurrecting the KH78/80 partial wave analysis
P. Piirola, E. Pietarinen, M. E. Sainio
Most of the data from the meson factories were available only after the partial wave analysis of Koch and Pietarinen was published over 20 years ago. Since then, both the expe…
hep-ph2000
Sigma-term physics
J. Gasser, M. E. Sainio
We consider sigma-terms in , and scattering. While the state of the art in is in principle crystal clear, the kaon-nucleon case is largely unexplored. The pion-…
hep-ph1998
Pion-pion interaction at low energy
M. E. Sainio
A brief discussion of the elastic pion-pion scattering amplitude to two loops in chiral perturbation theory is given. Some technical details of the evaluation of two-loop diagrams…