The mass shift of the vector mesons in nuclei is known to be a powerful tool for investigating the mechanism of generating hadron mass from the QCD vacuum. The mechanism is known to be the spontaneous breaking of chiral symmetry. One of the approach to investigate spontaneous breaking of chiral symmetry in nuclear media is formation of meson nucleus bound state and measurring energy level of the state which will be a direct connection to the (qq) expectation value in nucleus. We propose the experiment to study in-medium mass modification of the φ meson using the formation of φ-meson bound state at J-PARC/Japan. We demonstrate that a clear missing-mass spectrum can be obtained efficiently by (p; φ) spectroscopy together with the φ tagging, using the primary reaction channel pp → φ φ. A systematic study over several nuclear targets will yield a unique, definitive and precise determination of the in-medium mass modification of the vector meson φ (ss). This paper gives an overview of the physics motivation and the detector concept, and explains the direction of the initial research and development effort.
ASJC Scopus subject areas
- Physics and Astronomy(all)