Studies of dense matter in heavy-ion collisions at J-PARC

Sako, Hiroyuki   

At the future heavy-ion project at J-PARC (J-PARC-HI), we will study extremely dense matter 7 times as high as the normal nuclear density that was created in heavy-ion collisions at 1-19 AGeV/c. We will search for phase structures such as the first-order phase boundary and the critical point in the QCD phase diagram. We also aim at studying the properties of dense matter, such as the equation of state (EOS), leading to studies of neutron stars and neutron star mergers. In this talk, we will show the heavy-ion acceleration scheme at J-PARC, where we expect to produce the world's highest-rate heavy-ion beams of Hz with the ion species up to U. We will measure various observables in extremely high statistics, such as event-by-event fluctuations, dileptons, and multi-strangeness systems. We will show the design of the spectrometers to measure hadrons, dileptons, and hypernuclei, and evaluate their key performance.