Abstract
The new JINR project [1] is aimed at studies of highly excited nuclear matter created in nuclei by a high-energy deuteron beam. The matter is studied through observation of its particular decay products - pairs of energetic particles with a wide opening angle, close to 180°. The new precision hybrid magnetic spectrometer SCAN-3 is to be built for detecting charged (π ± , K ± , p) and neutral (n) particles produced at the JINR Nuclotron internal target in dA collisions. One of the main and complex tasks is a study of low-energy η A interaction and a search for η -bound states (η -mesic nuclei). Basic elements of the spectrometer and its characteristics are discussed in the article.
Highlights
Among the lightest pseudoscalar mesons the eta are very interesting objects because their properties are strongly influenced by a flavour SU(3) singlet component, presumably made of gluons, as the axial U(1) anomaly suggests
One of the main aims of the experiment SCAN-3 at the internal deuteron beam of the JINR Nuclotron is directed to studies of the ηA system
We will study quasi-bound states of the η in nuclei first predicted in theoretical works by Haider an Liu [3], who discovered that ηN and ηA interaction is attractive at low energies
Summary
Among the lightest pseudoscalar mesons the eta (and eta-prime) are very interesting objects because their properties are strongly influenced by a flavour SU(3) singlet component, presumably made of gluons, as the axial U(1) anomaly suggests. Masses and decay widths of these mesons, as well as their interactions with nucleons and nuclei, crucially depend on the singlet component that is affected by the nuclear environment. In this way studies of ηN and ηA interactions become related with very fundamental aspects of nuclear physics and QCD [2]. Information on the binding of η and eventually the lowenergy ηA interaction can be inferred from precise measurements of the energy spectra of the ηN and NN pairs. Principles of this approach are explained in more detail [4]. The new project SCAN-3 provides a significant increase of the energy resolution of the setup by including a magnetic spectrometer in the experimental installation and by increasing the time-of-flight base
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