Speaker
Description
J-PARC is one of the world’s highest-intensity proton accelerators for material and life sciences, neutrino physics, and hadron and nuclear physics in a few ten GeV. J-PARC-HI (J-PARC Heavy-Ion Project) aims to accelerate heavy-ion beams at J-PARC, where we will introduce a heavy-ion injector consisting of a heavy-ion linac and a booster ring, while the heavy-ion beams are accelerated in the existing 3-GeV synchrotron (RCS) and 30-GeV synchrotron (MR). The maximum beam rate is expected to reach the world's highest value of $10^{11}$ Hz, and the beam energy can range from 1 to 12 AGeV/c. We aim to unravel QCD phase structures such as the first-order phase boundary, the QCD critical point, and color superconducting phases, which are predicted in theoretical models in a high-baryon density regime in the QCD phase diagram. We will measure various observables such as event-by-event fluctuations, dileptons, collective flow, and two-particle correlations. We also search for various multi-strangeness particles/nuclei and study hadron-hadron interactions, including strangeness.
In this talk, we will discuss physics goals and experimental plans with a low-intensity injector and an experiment at the existing J-PARC E16 spectrometer (Phase 1), and with a high-intensity injector and an experiment with a new large acceptance spectrometer (Phase 2). We will also show the status of the dilepton and hadron measurements in p+A collisions at J-PARC, aiming to study the chiral-symmetry restoration with vector mesons in nuclei, which serves as a baseline experiment for J-PARC-HI.