Passage of heavy quarks through the fluctuating hot QCD medium

Abstract

The change in the energy of the moving heavy (charm and bottom) quarks due to field fluctuations present in the hot QCD medium has been studied. A finite quark chemical potential has been considered while modeling the hot QCD medium counting the fact that the upcoming experimental facilities such as Anti-proton and Ion Research (FAIR) and Nuclotron-based Ion Collider fAcility (NICA) are expected to operate at finite baryon density and moderate temperature. The effective kinetic theory approach has been adopted where the collisions have been incorporated using the well defined collisional kernel, known as Bhatnagar-Gross-Krook (BGK). To incorporate the non-ideal equations of state (EoSs) effects/ medium interaction effects, an extended effective fugacity model has been adopted. The momentum dependence of the energy change due to fluctuation for the charm and bottom quark has been investigated at different values of collision frequency and chemical potential. The results are exciting as the heavy quarks are found to gain energy due to fluctuations while moving through the produced medium at finite chemical potential and collision frequency.

Heavy quark transport in an anisotropic hot QCD medium: Collisional and Radiative processes

“…The two dominant processes that contribute to the energy loss of heavy quark in the medium are namely, the collisional (elastic interaction) and the inelastic interactions like gluon bremsstrahlung [24][25][26][27][28][29][30]. The heavy quark transport, its energy loss, and the associated physical observables such as nuclear suppression factor R AA , flow coefficients, etc have been investigated in several works in the literatures [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. Recently, drag and diffusion coefficients of the heavy quark undergoing radiative loss by soft gluons emission along with the collisional interactions have been studied in Ref.…”

Heavy quark transport coefficients in a viscous QCD medium with collisional and radiative processes

“…The Brownian motion of heavy quarks in the QGP medium can be described within the framework of the Fokker-Planck dynamics, where the interactions of the heavy quarks with the medium constituents are incorporated through the drag and momentum diffusion coefficients [25,26]. Several studies have been performed to explore the heavy quark transport coefficients, and the associated measured observables in heavy-ion collisions such as nuclear modification factor R AA , directed and elliptic flow coefficients in the hot QCD medium [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. However, most of the investigations considered the elastic interaction of the heavy quark in the medium.…”