Lattice NRQCD Study on Finite Temperature Behavior of Bottomonium
Aula Seminari (LNF)
Via Enrico Fermi, 40
00044 Frascati (Roma)
Heavy quarkonium is conjectured as one of probes for the quark-gluon plasma (QGP) which may be formed in heavy ion collision experiment. We study how the properties of various bottomonium states change as the system temperature is changed using Non-Relativistic Quantum ChromoDynamics (NRQCD) formulation on an anisotropic lattice. In the temperature range we study $(0.42 T_c < T < 2.09 T_c)$, S-wave bottomonium states such as $\Upsilon$ and $\eta_b$ are
found to stay in bound states but P-wave states such as $\chi_b$ are found to melt immediately above $T_c$. Further studying S-wave propagators by Maximum Entropy Method, we found that the S-wave ground state survives and the excited states are suppressed as the temperature increases. This behavior confirms with the recent CMS experiment result.