15 research outputs found
Majorana flipping of quarkonium spin states in transient magnetic field
We demonstrate that spin flipping transitions occur between various
quarkonium spin states due to transient magnetic field produced in non central
heavy ion collisions (HICs). The inhomogeneous nature of the magnetic field
results in \textit{non adiabatic evolution} of (spin)states of quarkonia moving
inside the transient magnetic environment. Our calculations explicitly show
that the consideration of azimuthal inhomogeneity gives rise to dynamical
mixing between different spin states owing to Majorana spin flipping. Notably,
this effect of non-adiabaticity is novel and distinct from previously predicted
mixing of the singlet and one of the triplet states of quarkonia in the
presence of a static and homogeneous magnetic field.Comment: 5 pages, 4 figure
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
Soft Gluon Radiation off Heavy Quarks beyond Eikonal Approximation
We calculate the soft gluon radiation spectrum off heavy quarks (HQs) interacting with light quarks (LQs) beyond small angle scattering (eikonality) approximation and thus generalize the dead-cone formula of heavy quarks extensively used in the literatures of Quark-Gluon Plasma (QGP) phenomenology to the large scattering angle regime which may be important in the energy loss of energetic heavy quarks in the deconfined Quark-Gluon Plasma medium. In the proper limits, we reproduce all the relevant existing formulae for the gluon radiation distribution off energetic quarks, heavy or light, used in the QGP phenomenology
Momentum dependence of drag coefficients and heavy flavour suppression in quark gluon plasma
The momentum dependence of the drag coefficient of heavy quarks propagating
through quark gluon plasma (QGP) has been evaluated. The results have been used
to estimate the nuclear suppression factor of charm and bottom quarks in QGP.
We observe that the momentum dependence of the transport coefficients plays
crucial role in the suppression of the heavy quarks and consequently in
discerning the properties of QGP using heavy flavours as a probe. We show that
the large suppression of the heavy quarks observed at RHIC and LHC is
predominantly due to the radiative losses. The suppression of in Pb+Pb
collisions at LHC energy - recently measured by the ALICE collaboration has
also been studied.Comment: Minor changes in the tex