2d Di-Hadron Correlations at $\sqrt(s_NN)$ = 2.76 TeV using the ALICE Experiment

The Large Hadron Collider (LHC) at CERN Geneva, Switzerland, attempts to recreate the initial conditions at the beginning of our universe. Heavy ions ( 208 Pb ) are accelerated up to 0.999999 of the speed of the light and collided at sqrt(sNN) = 2.76 TeV (center of mass energy per nucleon) in order to recreate the initial energy density around 10^-6 s after the Big Bang. The theory of Quantum Chromo Dynamics (QCD) predicts the formation of a primordial nuclear matter phase known as Quark Gluon Plasma (QGP) under these experimental conditions. This dissertation focuses on studying this QCD medium using data from the `A Large Ion Collider Experiment' (ALICE). The study of two-dimensional two-particle correlations of emitted charged particles carries valuable time integrated information of the dynamical QCD medium. Long-range correlations between particles in angular and momentum space generally can be attributed to collective behavior, which is not found in a superposition of elementary collisions. The focus of this thesis is to understand the long-range correlation structure observed in pseudo-rapidity as a function of pT and to obtain better estimates of medium properties of the QGP, such as shear viscosity. The interpretation is based on empirical models describing well-established hydrodynamical collective flow phenomena and possible novel phenomena related to in-medium parton fragmentation. The flow and Gaussian parameters extracted from the fit model can be used to constrain medium properties such as the initial gluon density, the shear viscosity and the partonic energy transport coefficient.