Topological susceptibility at zero and finite $T$ in SU(3) Yang-Mills   theory
  We determine the topological susceptibility $\chi$ at T=0 in pure SU(3) gauge theory and its behaviour at finite $T$ across the deconfining transition. We use an improved topological charge density operator. $\chi$ drops sharply by one order of magnitude at the deconfining temperature $T_c$. 
B. All\'es (INFN-Pisa), M. D'Elia (Genova) and A. Di Giacomo (Pisa)