Abstract
We plan a missing-mass spectroscopy experiment of 0 mesic nuclei with the 12 C(p,d) 0 11 C reaction to study in-medium properties of the 0 meson. In nuclear medium, due to restoration of chiral symmetry, the mass of the 0 meson may be reduced, and 0 bound states in a nucleus may exist. The experiment will be started at GSI with a 2.5 GeV proton beam using FRS as a spectrometer and will be continued at Super-FRS at FAIR. The plan of the experiment and development of a Cherenkov detector and an optics mode are described.
Highlights
The η meson has a peculiarly large mass among the light pseudoscalar mesons
We are planning an experimental search for η mesic nuclei by missing-mass spectroscopy of the 12C(p,d)η ⊗ 11C reaction at GSI [8, 9]
We have developed a high-refractive-index aerogel Cherenkov counter for particle identification at the hardware level
Summary
The η meson has a peculiarly large mass among the light pseudoscalar mesons. This is theoretically understood as a consequence of the UA(1) anomaly effect in combination with a non-vanishing chiral condensate qq and explicit chiral symmetry breaking in the low energy region of QCD [1, 2]. According to Nambu–Jona-Lasinio (NJL) model calculations, the η mass at normal nuclear density is reduced by about 150 MeV/c2 [3, 4] Such a large mass reduction implies a strong attractive potential between η and a nucleus, and η meson-nucleus bound states (η mesic nuclei) may exist [4,5,6]. The CBELSA/TAPS collaboration reported that the absorption width of the η meson at the nuclear saturation density is around 15 – 25 MeV for the average η momentum at 1050 MeV/c [7] This implies that the decay width of η mesic nuclei could be small as well, and they may be observed as narrow peaks experimentally.
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