Fully-heavy baryons $QQQ$ in vacuum and hot QCD medium

We study the properties of fully-heavy baryons in the vacuum and the hot QCD medium, which is created in relativistic heavy-ion collisions. Masses and wave functions of ${\mathrm{\Omega }}_{ccc}$, ${\mathrm{\Omega }}_{ccb}$, ${\mathrm{\Omega }}_{bbc}$, and ${\mathrm{\Omega }}_{bbb}$ up to the second radial excited states are obtained by solving the three-body Schrödinger equation with Hyperspherical Harmonics method. With parameters completely fixed by fitting quarkonium boundstates in vacuum, we predicted the masses for $1S$, $2S$, and $3S$ states of fully-heavy baryons. We also computed the temperature dependence of baryon masses and the thermal widths in a hot QCD medium. These properties are important to precise study of fully-heavy baryon production in heavy ion collisions.