Status of the search for $\eta$-mesic nuclei with particular focus on $\eta$-Helium bound states

Abstract

In this paper the search for eta-mesic nuclei with particular focus on light $\eta$-He bound states is reviewed. A brief description of recent theoretical studies and experimental results is presented.

References in corpus (16)

• Origin of resonances in the chiral unitary approach
• Measurement of the dp -->3He eta reaction near threshold
• Meson-nucleus potentials and the search for meson-nucleus bound states
• Determination of the eta'-proton scattering length in free space
• Search for eta-mesic 4He in the dd->3He n pi0 and dd->3He p pi- reactions with the WASA-at-COSY facility
• Formation of eta-mesic nuclei by (pi,N) reaction and N^*(1535) in medium
• Cross Section and Tensor Analysing Power of the $\vec{d}d\to \eta \alpha$ Reaction Near Threshold
• Determination of the ${\mathbf{\eta }}^3\mathrm{He}$ threshold structure from the low energy $\mathbf{pd}\to {\mathbf{\eta }}^3\mathrm{He}$ reaction
• Mixing of pseudoscalar-baryon and vector-baryon in the $J^P=1/2^{-}$ sector and the $N^{\ast }$(1535) and $N^{\ast }$(1650) resonances
• Absence of spin dependence in the final state interaction of the d(pol) p --> 3He eta reaction
• Search for Quasi Bound $\eta$ Mesons
• Onset of $\eta$-meson binding in the He isotopes
• $\eta$-nucleus interaction from the $d+d$ reaction around the $\eta$ production threshold
• Momentum distribution of N${}^{\ast }$ in nuclei
• Interference and nuclear medium effects on the eta-mesic nuclear spectrum
• Search for the $\eta$ mesic ${}^3$He in the $pd\to dp{\pi }^0$ reaction with the WASA-at-COSY facility