2005/08/10 by J. A. Niskanen, J.A. Niskanen, Niskanen, J. A.
Physics and Astronomy · #FOS: Physical sciences #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-th
paper · pdf · doi:10.48550/arxiv.nucl-th/0508021
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arxiv created 2005/08/10 · openalex publication_date 2005/08/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In two recent analyses of eta meson production a very small imaginary part was obtained for the eta-He3 scattering length, which is in contradiction with most theoretical predictions. In this report a plausible explanation is given to this unexpectedly weak absorption by suppression of the two main inelasticity channels. It is stressed that the real and imaginary parts of the elementary scattering length do not necessarily always have the same isospin algebraic and spatial properties in a nuclear environment and caution should be exercised in their use in multiple scattering calculations and even constructing simple optical potentials.