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Department of Physics, Faculty of Engineering and Technology, NIMS University, Jaipur, Rajasthan, India

*Corresponding Author:

- Rakesh Kumar

Department of Physics

Faculty of Engineering and Technology

NIMS University, Jaipur

Rajasthan, India

**Tel:**08588824061

**E-mail:**[email protected]

**Received Date:** 02/11/2016 **Accepted Date:** 06/12/2016 **Published Date: **12/12/2016

**Visit for more related articles at** Research & Reviews: Journal of Engineering and Technology

Heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC) results a hot system at energy density. This would result a fluid matter where collective flow is observed at zero viscosity. The suppression of jets are observes in the form of mach cones. This suppression indicates strongly coupled plasma where thermal fluctuations in the plasma characterize the high energy density of the medium. This results in color confinement phase of the quark gluon plasma. The suppression of both light (u, d, s) and heavy (c, b) hadrons is observed at large transverse momenta.

Hadron suppression, Pseudorapidity rate dE/dη, Quark jets, Mach cone

The study of ultra-relativistic heavy ion collisions at RHIC offers the possibility concerning for instant the state of matter called quark gluon plasma at very high temperature and density. We propose to consider strongly coupled classical non-relativistic plasmas to learn about qualitative features of the strongly coupled quark gluon plasma [1].

The Relativistic Heavy Ion Collider (RHIC) began colliding nuclei at ultra-relativistic energies in 2000 to investigate the properties
of hot, dense QCD. RHIC accelerates and collides a range of nuclei from protons to gold (Au) at centre-of-mass energies up
to √s=500 GeV for p + p and √s_{NN}=200 GeV for Au+Au. The Large Hadron Collider (LHC) heavy ion program will explore further into
the high energy density regime of QCD. The LHC will collide nuclei at a top energy of √s_{NN}=7 TeV for Pb+Pb with ALICE, ATLAS and
CMS expected to participate in heavy ion data taking.

The jet quenching and this suppression occurs when partons travels through hot and dense plasma with a consequence suppression of high momentum particles are observed in Relativistic Heavy Ion Program at RHIC [2-4] of the energy loss of these partons. This energy loss is deposited in the hot dense medium or absorption of the radiated gluons which leads to the collective effect i.e., formation of a mach cone. The redistribution of the jet energy and momentum is reflected in the correlations of particles associated with the jet [5].

Particles evaluated in gluon matter with large transverse momentum more than the QCD scale ∧_{QCD} when ∧_{QCD} ∼**0.2** GeV
in QCD estimation. The hard probe produced in a very short time scale τ_{0} =1/ p_{T} ∼ 0.1 *fm* / c when partons scattered with large
transverse momentum, they signify to such hard probes. At large **P _{T}** , partons split into quark-antiquark pairs and subsequently
radiating gluons.

The data obtained at RHIC confirms that the quark gluon plasma produced in a strongly interacting medium. But the absolute
value of viscosity to entropy ratio ** η / s** leads to the weak coupling medium which is based on HTL approximation. This
approximation clears the frame of weakly coupled quasi particles with partons. In jet quenching, the particles belongs to jet are
excited and correlation have been observed. The shock waves in the form of Mach cones are formed. These shock waves are
associated with quasi-particles. The Mach shocks generated due to partonic jets propagating through a deconfined strongly interacting
matter. The QGP expands both radially and longitudinally which deform the shock waves. In hydrodynamics, matter in the
form of fluid can only generate and propagate shock waves which can be described by quasi particle picture. Thus shock waves
can create entropy in the system [6]. There is a general relation between jet parameter and coffecient of viscosity η for weakly
coupled partonic plasma.

Non-relativistic plasma is said to be strongly coupled if the value of Coulomb coupling parameter Γ = *q*^{2} / *dT* is larger than
1 and the plasma exist in liquid form if the coulomb coupling parameter is lower than the value one [7,8].

**Quenching Effect**

There are many charge particles within the plasma that can influence many others nearby quasi particles. This sets a sphere
of influence. Such a sphere around the charge particle through which it can influence nearby many quasi particles is called a Debye
sphere. The radius of Debye sphere is represented by the Debye mean free path λ_{d} This Debye mean free path is also called
the Debye screening length. The number of quasi particles influenced by Debye sphere is given by Plasma parameter **∧ = 4π nλ_{d}^{3 }** The
relation between shear viscosity

η=Cρ (*p*) λ* _{d}*(1)

The Casimir invariant for gluon is equal to c=1/3 and momentum* p=3T* for collection of thermal massless particles and the
Debye length** λ _{d}=1/m_{D}** where mD is the Debye screening mass. Therefore,

(2)

Using the relation** s∼3.6ρ** for a gas of free massless bosons, ratio of shear viscosity to entropy relative to Debye mean
free path may be derived as,

(3)

(4)

Using relation** λ _{d}=1/md** where

(5)

This shows that the large value of Debye mass for quasi-particles, there will be a small value of entropy to density ratio **η / s** and it is considered to be bounded by the quantum limit

The perturbative distribution in QCD always shows the interaction between hard jets and strongly coupled plasma medium.
But at the short distance, there is a weak QCD coupling and the partonic excitation reduced and finally dies. The Debye screening mass **1/ m_{d} ∼ 1/gT** is very short in perturbative QCD at weak coupling. Therefore, we can approximate the relations,

(6)

Or,

(7)

Where, g' is the ratio between potential energy to the kinetic energy per particle of the medium i.e., Therefore for weak coupling,

(8)

Where, e is electric charge on the quasi particle and n is number density of quasi particles. For weak interaction **g'<<1** which is also bounded by the limit

We can find the equation for jet quenching parameter weakly coupled plasma which ultimately confirmed the quasiparticle dominated quark gluon plasma. The equation of shear viscosity to entropy ratio [9] is,

(9)

Comparing equations, we get

(10)

After solving and rearranging the equation gives the quenching parameter,

(11)

This relation shows that the jet quenching is large for small value of mean free path or Debye screening length and for large value of temperature.

The result is nearly equal to the lower bound limit for **η / s **and lies within the range of shear viscosity to entropy ratio. The
result is conflict with the RHIC observation. But the quark gluon plasma at RHIC is thought to be considered as strongly coupled regime
and cannot be described as weakly coupled or quasi particle plasma. Also, quenching parameter continuous to increases
with temperature which suggested that may be broadly applicable as a coupling strength of quark gluon plasma. Therefore we
generally observed the following relation holds for strong or weak coupled plasma:

The relation confirmed that the value of shear viscosity to entropy ratio is generally small as the jet quenching is high.

One of the authors (Rakesh Kumar) thanks to Dr. G.L. Sawhney for kind support in understanding of Jet Quenching phenomena The theoretical works in this paper are supported by the Department of Physics, NIMS University and possible cooperation of Department of Physics, ARSD College and University of Delhi.

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