? meson in hot and dense matter
The mass of the ? meson is reduced in hot and dense matter which consists of an appreciable number of strange particles.
Strange particles are abundantly produced in relativistic heavy-ion collisions ? mass of the ? meson is reduced ? production of the ? meson is enhanced.
The mass of the ? meson at a given temperature decreases with increasing density ? density probe.
M. Asakawa et al., Nucl. Phys. A572, 732 (1994)