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\(\eta\)-4He interaction from the \(dd \rightarrow \eta\)4He reaction near threshold

  • Ju-Jun XieEmail author
  • Wei-Hong Liang
  • Eulogio Oset
Regular Article - Theoretical Physics
  • 12 Downloads

Abstract.

We analyze the data on the total cross sections for the \(dd \rightarrow \eta {}^{4}\mathrm{He}\) reaction close to threshold and look for possible \( \eta {}^{4}\mathrm{He}\) bound states. We develop a framework in which the \( \eta {}^{4}\mathrm{He}\) optical potential is the key ingredient, rather than parameterizing the scattering matrix, as is usually done. The strength of this potential, together with some production parameters, are fitted to the available experimental data. The relationship of the scattering matrix to the optical potential is established using the Bethe-Salpeter equation and the \( \eta {}^{4}\mathrm{He}\) loop function incorporates the range of the interaction given by the experimental 4He density. However, when we look for poles of the scattering matrix, we get poles in the bound region, poles in the positive energy region or no poles at all. If we further restrict the results with constraints from a theoretical model with all its uncertainties the bound states are not allowed. However, we find a bump structure in \( \vert T\vert^{2}\) of the \( \eta {}^{4}\mathrm{He} \rightarrow \eta {}^{4}\mathrm{He}\) scattering amplitude below threshold for the remaining solutions.

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Copyright information

© SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Modern PhysicsChinese Academy of SciencesLanzhouChina
  2. 2.Department of PhysicsGuangxi Normal UniversityGuilinChina
  3. 3.Departamento de Fısica Teórica and IFICCentro Mixto Universidad de Valencia-CSIC Institutos de Investigación de PaternaValenciaSpain

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