Competition of heavy quark radiative and collisional energy loss in deconfined matter

Abstract

Abstract. We extend our recently advanced model on collisional energy loss of heavy quarks in a quark gluon plasma (QGP) by including radiative energy loss. We discuss the approach and present first preliminary results, including a comparison of the role of both types of energy loss for experimental data. We draw the conclusion that the present nuclear modification factor R AA data on non-photonic single electrons does not permit to "select" between this two types of energy-loss mechanisms.

Observation ofD0Meson Nuclear Modifications inAu+AuCollisions atAdamczyk1, Adkins2, Agakishiev3 et al. 2014Phys. Rev. Lett.19266901View full textAdd to dashboardCite

“…The calculation considered collisional energy loss and charm-quark hadronization, including both fragmentation and coalescence mechanisms. The SUBATECH group [13] used the hard-thermal-loop (HTL) analytic approach to calculate charm-medium interactions with both fragmentation and coalescence processes. Their calculations suggest that the radiative energy loss has a negligible impact on the final charmed hadron R AA for p T < 6 GeV=c.…”

“…In highenergy heavy-ion collisions, the large charm-pair abundance could increase the coalescence probability. The coalescence of charm with a light quark from the medium with a large radial flow may introduce a p T -dependent modification to the observed charmed hadron spectrum compared to that from fragmentation [12,13]. Furthermore, this may lead to a baryon-to-meson enhancement for charmed hadrons similar to that observed for light-flavor hadrons [14,15].…”

Energy loss, hadronization, and hadronic interactions of heavy flavors in relativistic heavy-ion collisions

“…Various transport models have been constructed to study the heavy quark motion inside dense nuclear matter, such as the parton cascade model based on the Boltzmann equation [20][21][22][23] and the linearized Boltzmann approach coupled to a hydrodynamic background [24,25]. In the limit of small momentum transfer, the multiple scatterings of heavy quarks inside a thermalized medium can be treated as Brownian motion, and the Boltzmann equation for quasi-elastic scatterings is then reduced to the Fokker-Plank equation which can then be stochastically realized by the Langevin equation.…”

Single electron yields from semileptonic charm and bottom hadron decays inAu+Aucollisions atsNN=200GeV

“…The possibility that charm quarks follow the QGP flow was postulated early on [23], and more detailed Langevin-type calculations with drag and diffusion of these heavy quarks yield a reasonable description of the electron data [24][25][26][27][28][29]. Many of these theory calculations incorporate radiative and collisional energy loss of the heavy quarks in the QGP that are particularly important at high-p T , where QGP flow effects are expected to be sub-dominant.…”