5. Theoretical Physics (CSN4)

Lattice NRQCD Study on Finite Temperature Behavior of Bottomonium

by Dr Seyong Kim

Aula Seminari (LNF)

Aula Seminari


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.