Abstract
QCD monopoles are magnetically charged quasiparticles whose Bose-Einstein condensation (BEC) at $T<T_c$ creates electric confinement and flux tubes. The "magnetic scenario" of QCD proposes that scattering on the non-condensed component of the monopole ensemble at $T>T_c$ is responsible for the unusual kinetic properties of QGP. In this paper, we study the contribution of the monopoles to jet quenching phenomenon, using the BDMPS framework and hydrodynamic backgrounds. In the lowest order for cross sections, we calculate the nuclear modification factor, $R_\text{AA},$ and azimuthal anisotropy, $v_2$, of jets, as well as the dijet asymmetry, $A_j$, and compare those to the available data. We find relatively good agreement with experiment when using realistic hydrodynamic backgrounds. In addition, we find that event-by-event fluctuations are not necessary to reproduce $R_\text{AA}$ and $v_2$ data, but play a role in $A_j$. Since the monopole-induced effects are maximal at $T\approx T_c$, we predict that their role should be significantly larger, relative to quarks and gluons, at lower RHIC energies.
Highlights
The Relativistic Heavy Ion Collider (RHIC) at BNL and the Large Hadron Collider (LHC) at CERN provide an abundance of data on a wide range of hadronic collisions, ranging from proton-proton and proton-nucleus collisions to nucleus-nucleus collisions
Central and midcentral heavy-ion collisions at sufficiently high beam energies produced a novel form of matter, the quark-gluon plasma (QGP)
At the LHC, which produces about twice larger entropy and particle number than RHIC, the nuclear modification was expected to be further enhanced; this, has not happened
Summary
The Relativistic Heavy Ion Collider (RHIC) at BNL and the Large Hadron Collider (LHC) at CERN provide an abundance of data on a wide range of hadronic collisions, ranging from proton-proton and proton-nucleus collisions to nucleus-nucleus (heavy-ion) collisions. High-transverse-momentum partons subsequently traverse the QGP medium created in the heavy-ion collisions These fast moving partons suffer collisional and radiative energy loss, leading to the phenomenon of “jet quenching.”. At the LHC, which produces about twice larger entropy and particle number than RHIC, the nuclear modification was expected to be further enhanced; this, has not happened Another important property of the in-medium jet energy loss is the azimuthal anisotropy, v2ðp⊥Þ, the second Fourier component of the expansion of RAAðp⊥; φÞ in azimuthal angle φ. This magnetic scenario was further used for explaining unusual properties of QGP by Liao and Shuryak [14,15,16] In this scenario, the uncondensed magnetic monopoles play a dominant role near the QCD critical temperature, Tc, where their density peaks.
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