学術雑誌論文 Nonperturbative estimate of the heavy quark momentum diffusion coefficient

Francis, A.  ,  Kaczmarek, O.  ,  Laine, M.  ,  Neuhaus, T.  ,  Ohno, H.

92 ( 11 )  , p.116003 , 2015-12 , American Physical Society
ISSN:1550-7998
NII書誌ID(NCID):AA00773624
内容記述
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 1923×48 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)T3. This implies that the “drag coefficient,” characterizing the time scale at which heavy quarks adjust to hydrodynamic flow, is η−1D=(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.
本文を読む

https://tsukuba.repo.nii.ac.jp/?action=repository_action_common_download&item_id=36794&item_no=1&attribute_id=17&file_no=1

このアイテムのアクセス数:  回

その他の情報