Wakes in the quark-gluon plasma

Abstract

Using the high temperature approximation we study, within the linear response theory, the wake in the quark-gluon plasma by a fast parton owing to dynamical screening in the space like region. When the parton moves with a speed less than the average speed of the plasmon, we find that the wake structure corresponds to a screening charge cloud traveling with the parton with one sign flip in the induced charge density resulting in a Lennard-Jones type potential in the outward flow with a short range repulsive and a long range attractive part. On the other hand if the parton moves with a speed higher than that of plasmon, the wake structure in the induced charge density is found to have alternate sign flips and the wake potential in the outward flow oscillates analogous to Cerenkov like wave generation with a Mach cone structure trailing the moving parton. The potential normal to the motion of the parton indicates a transverse flow in the system. We also calculate the potential due to a color dipole and discuss consequences of possible new bound states and $J/\psi$ suppression in the quark-gluon plasma.Comment: 20 pages, 14 figures (high resolution figures available with authors); version accepted for publication in Phys. Rev.

Three-loop HTLpt thermodynamics at finite temperature and chemical potential

“…Quantities such as the dilepton production rate [96,97], photon production rate [98], single quark and quark anti-quark potentials [99][100][101][102][103][104][105][106][107], fermion damping rate [108][109][110], photon damping rate [111], gluon damping rate [112,113], jet energy loss [114][115][116][117][118][119][120][121][122][123][124][125], plasma instabilities [126][127][128][129][130][131][132], thermal axion production [133], and lepton asymmetry during leptogenesis [134,135] have also been calculated using HTLpt. We note, however, that most of the papers above have only worked at what we would call leading order in HTLpt.…”

Impact of momentum anisotropy and turbulent chromo-fields on thermal particle production in quark–gluon-plasma medium

“…The collective plasma modes in anisotropic QGP have been studied in [26,[106][107][108]. The collisional energy loss in anisotropic QGP [109], momentum broadening [110], radiative energy loss [111], and the wake potential [112,113] are some of the related effects that have been investigated in the anisotropic QGP. For recent reviews, we refer the reader to Refs.…”

Transport properties and Langevin dynamics of heavy quarks and quarkonia in the Quark Gluon Plasma

“…Similar studies, limited to the energy-loss problem and to the definition of a "dipole potential", can be found in Refs. [34,36]. Here the problem is addressed by solving the Maxwell equations in the linear response approximation for a QQ pair (playing the role of an external current) propagating in the QGP, modeled as a dielectric medium.…”

“…Following the choice adopted in Ref. [36], we take, without loss of generality, v along the z-axis, r ≡ (r ⊥ , 0, z) in the zx-plane and the exchanged momentum as q = q(sin θ cos φ, sin θ sin φ, cos θ).…”