354 research outputs found
Soft gluon multiplicity distribution revisited
In this paper the soft gluon radiation from partonic interaction of the type:
+ gluon has been revisited and a correction term to the widely used
Gunion-Bertsch (GB) formula is obtained.Comment: Few typos corrected, to appear in Phys. Rev. D (rapid communication
Probing Quark Gluon Plasma by Heavy Flavors
The drag and diffusion coefficients of charm and bottom quarks propagating
through quark gluon plasma (QGP) have been evaluated within the framework of
perturbative Quantum Chromodynamics (pQCD). Both radiative and collisional
processes of dissipation are included in evaluating these transport
coefficients. The dead cone as well as the LPM effects on radiative energy loss
of heavy quarks have also been considered. The Fokker Planck equation has been
solved to study the dissipation of heavy quarks momentum in QGP. The nuclear
suppression factor, and the elliptic flow of the
non-photonic electrons resulting from the semi-leptonic decays of hadrons
containing charm and bottom quarks have been evaluated for RHIC and LHC nuclear
collision conditions. We find that the observed and at
RHIC can be reproduced simultaneously within the pQCD framework.Comment: To appear in the proceedings of WPCF, 2011, Tokyo, Japa
A random walk with heavy flavours
We focus on evaluating transport coefficients like drag and diffusion of
heavy quarks (HQ) passing through Quark Gluon Plasma using perturbative QCD
(pQCD). Experimental observable like nuclear suppression factor (RAA) of HQ is
evaluated for both zero and non-zero baryonic chemical potential ({\mu}_B)
scenarios using Fokker- Planck equation. Theoretical estimates of RAA are
contrasted with experiments.Comment: Invited article in Special Issue: "Physics of Quark Gluon Plasma: An
Update and Status Report" in Advances in High Energy Physic
Open heavy flavors: Theory
A brief overview of the theory of open heavy flavor dynamics in QCD matter
produced in high energy heavy-ion collisions is presented. First, we will
summarise the phenomenological efforts to estimate the heavy quark diffusion
coefficients obtained within different models. Then, the recent theoretical
developments from different groups to probe the medium properties using heavy
quarks will be presented. Heavy quarks are also considered as an ideal probe
for the initial stage of heavy-ion collisions. In the end, we present the
recent theoretical progress made to probe the early-stage effects,
pre-equilibrium phase, and electromagnetic fields.Comment: Hard Probes 2023 conference proceeding
Transport coefficients of heavy baryons
We compute the transport coefficients (drag and momentum diffusion) of the
low-lying heavy baryons and in a medium of light mesons
formed at the later stages of high-energy heavy-ion collisions. We employ the
Fokker-Planck approach to obtain the transport coefficients from unitarized
baryon-meson interactions based on effective field theories that respect chiral
and heavy-quark symmetries. We provide the transport coefficients as a function
of temperature and heavy-baryon momentum, and analyze the applicability of
certain nonrelativistic estimates. Moreover we compare our outcome for the
spatial diffusion coefficient to the one coming from the solution of the
Boltzmann-Uehling-Uhlenbeck transport equation and we find a very good
agreement between both calculations. The transport coefficients for
and in a thermal bath will be used in a subsequent publication as
input in a Langevin evolution code for the generation and propagation of heavy
particles in heavy-ion collisions at LHC and RHIC energies.Comment: 26 pages, 12 figures. Title changed. Small additions and corrections.
Version accepted for publication by Physical Review D journa
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