Formation of eta-mesic nuclei by (pi,N) reaction and N^*(1535) in medium

Abstract

We calculate formation spectra of eta-nucleus systems in (pi,N) reactions with nuclear targets, which can be performed at existing and/or forthcoming facilities, including J-PARC, in order to investigate eta-nucleus interactions. Based on the N^*(1535) dominance in the eta N system, eta-mesic nuclei are suitable systems for study of in-medium properties of the N^*(1535) baryon resonance, such as reduction of the mass difference of N and N^* in nuclear medium, which affects level structure of the eta and N^*-hole modes. We find that clear information on the in-medium N^*- and eta-nucleus interactions can be obtained through the formation spectra of the eta-mesic nuclei. We also discuss the experimental feasibilities by showing several spectra of (pi,N) reactions calculated with possible experimental settings. Coincident measurements of pi N pairs from the N^* decays in nuclei help us to reduce backgrounds.

12 pages, 10 figures

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• In-medium nuclear interactions of low-energy hadrons
• Origin of resonances in the chiral unitary approach
• In-medium Pion and Partial Restoration of Chiral Symmetry
• In--Flight ($K^{-},p$) Reactions for the Formation of Kaonic Atoms and Kaonic Nuclei in Green function method
• Level crossing of particle-hole and mesonic modes in eta mesic nuclei
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• Possible eta-mesic 3He states within the finite rank approximation
• Eta-mesic nuclei in relativistic mean-field theory
• The structure of N(1535) in the aspect of chiral symmetry

Cited by in corpus (9)

• Formation of eta-prime(958)-mesic nuclei by (p,d) reaction
• Search for Quasi Bound $\eta$ Mesons
• Experimental constraints on the $\omega$-nucleus real potential
• $\eta$-nucleus interaction from the $d+d$ reaction around the $\eta$ production threshold
• Chiral and U_A(1) symmetry in correlation functions in medium
• Spectral function of the ${\eta }^{\prime }$ meson in nuclear medium based on phenomenological models
• Status of the search for $\eta$-mesic nuclei with particular focus on $\eta$-Helium bound states
• Quartet of spin-3/2 baryons in chiral multiplet $(1,1/2)\oplus (1/2,1)$ with mirror assignment
• Pseudoscalar mesons from a PNJL model at zero temperature