The Alt-Grassberger-Sandhas N-body theory is used to study interaction of η mesons with d, He3, and He4. Separable expansion of the subamplitudes is adopted to convert the integral equations into the quasi-two-body form. The resulting formalism is applied to fit the existing data for low-energy η production of few-nucleon targets. On the basis of this fitting procedure the scattering lengths aηd, aηHe3, aηHe4 as well as the subthreshold behavior of the elementary ηN scattering amplitude are obtained.
ASJC Scopus subject areas
- Nuclear and High Energy Physics