  We have studied the collisional time and relaxation time of a QGP(Quark-Gluon
Plasma) by parameterizing them by temperature. From this parameterization we
have obtained the decay rate parameterized by temperature which further helps
us to calculate and compare the shear viscosity to entropy density ratio of a
QGP with the KSS(Kovtun-Son-Starinets) result.
