Triply heavy baryons QQQ in vacuum and in a hot QCD medium

We study the properties of baryons consisting of three heavy quarks ("triply heavy baryons") in the vacuum and in a hot QCD medium, which is created in relativistic heavy-ion collisions. Masses and wave functions of Omega(ccc), Omega(ccb), Omega(bbc), and Omega(bbb) up to the second radial excited states are obtained by solving the three-body Schrodinger equation with the hyperspherical harmonics method. With parameters completely fixed by fitting quarkonium bound states in vacuum, we predicted the masses for 1S, 2S, and 3S states of triply heavy baryons. We also computed the temperature dependence of baryon masses and the thermal widths in a hot QCD medium. These properties are important for the precise study of triply heavy baryon production in heavy ion collisions.