@article{oai:tsukuba.repo.nii.ac.jp:00036794, author = {Francis, A. and Kaczmarek, O. and Laine, M. and Neuhaus, T. and Ohno, H. and 大野, 浩史}, issue = {11}, journal = {Physical review D}, month = {Dec}, note = {We estimate the momentum diffusion coefficient of a heavy quark within a pure SU(3) plasma at a temperature of about 1.5Tc. Large-scale Monte Carlo simulations on a series of lattices extending up to 192^3×48 permit us to carry out a continuum extrapolation of the so-called color-electric imaginary-time correlator. The extrapolated correlator is analyzed with the help of theoretically motivated models for the corresponding spectral function. Evidence for a nonzero transport coefficient is found and, incorporating systematic uncertainties reflecting model assumptions, we obtain κ=(1.8-3.4)T^3. This implies that the “drag coefficient,” characterizing the time scale at which heavy quarks adjust to hydrodynamic flow, is η^-1_D=(1.8-3.4)(Tc/T)^2 (M/1.5 GeV) fm/c, where M is the heavy quark kinetic mass. The results apply to bottom and, with somewhat larger systematic uncertainties, to charm quarks.}, title = {Nonperturbative estimate of the heavy quark momentum diffusion coefficient}, volume = {92}, year = {2015}, yomi = {オオノ, ヒロシ} }