Baryon resonance production in the $\pi+d$ reaction and search for $\eta$-mesic nuclei at J-PARC

TL;DR

This paper proposes a method to study $ ext{eta}$-meson interactions and searches for $ ext{eta}$-mesic nuclei using $ ext{pi} + d$ reactions at J-PARC, aiming to enhance understanding of meson-nucleon scattering and exotic nuclear states.

Contribution

It introduces a novel double-scattering reaction approach to investigate $ ext{eta}$-nucleon interactions and discusses experimental strategies for detecting $ ext{eta}$-mesic nuclei.

Findings

Proposed a new reaction measurement method for $ ext{eta}$-nucleon scattering.

Discussed experimental techniques for $ ext{eta}$-mesic nuclei search.

Provided theoretical framework for $ ext{pi} + d$ reaction analysis.

Abstract

A double-scattering reaction $\pi^+ + d\to p + p + \eta$, where an $\eta$ meson is rescattered, may provide new information on the $\eta N\to \eta N$ scattering. An idea to measure this reaction is proposed. Moreover, experimental search for $\eta$-mesic nuclei by the same $(\pi, N)$ reaction is discussed.