arXiv subjects

B. L. Friman

Publications and source records attributed to B. L. Friman.

2 recordsLinked to original sources

arXiv1995

Photoproduction of $η$-mesons off protons and deuterons

An effective field theory with hadrons and photons is constructed, where the hadronic parameters are determined by fitting elastic $π$N scattering data. The predicted pion-induced $η$-production on the nucleon agrees well with the data. The hadronic model is then used to describe the final-state interaction in photoinduced processes. We present a consistent description of pion photoproduction in the E$_0^+$-channel and of the total cross sections for photoinduced $η$-production on the proton as well as on the deuteron.

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arXiv1994

Resonance Model for $π$N Scattering and $η$-Meson Production in the s$_{11}$ Channel

A model for $π$N scattering and $η$-meson production in the S$_{11}$ channel is presented. The model includes $π$N-scattering Born terms as well as the N$^*${} resonances S$_{11}$(1535) and S$_{11}$(1610). The $T$-matrix is computed in the $K$-matrix approximation. The parameters of the model are determined by fitting the elastic $π$N-scattering $T$-matrix to empirical data. We find an excellent fit for all energies up to $\sqrt{s}$ = 1.75 GeV. Furthermore, a good description of the cross section for $π^- + p \rightarrow η+ n$ is obtained without further adjustment of parameters.

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