Probing Two Particle Angular Correlations In Proton-nucleus Collisions

The fundamental goal of experiments involving heavy ion collisions at ultra-relativistic energies is to probe nuclear matter under extreme conditions.Multi-particle correlation studies have proven to be one of the powerful tools in advancing and exploring the underlying mechanism of particle productions constituting high energy hadronic collisions.In this dissertation,on one hand,we investigated two-particle angular correlations in proton-nucleus collisions in color glass formalism under the McLerran-Venugopalan model.We have expressed the multiple scatterings of the partons inside the projectile proton on the dense gluons inside the target nucleus in terms of Wilson lines.As a result,we observed that they generate interesting correlations,which according to our argument drawn from our motivation,can be partly responsible for the signals of collectivity measured at RHIC and at the LHC.We derived analytically expressions for the dipole-dipole correlator.The two-particle anisotropic flows,vn{2},and their cumulants,cn{2},were equally computed.On the other hand,under multi-dipole correlations,computation of the three-dipole correlator was prioritized.In addition,we derived a general expression for the n-dipole correlator which can be applied in analytical studies of multi-particle production in scatterings between hard probes and dense targets.Furthermore,computations of three-particle cumulants anisotropic and their Nc scale were taken into consideration.Last but not the least,we observed that in order to have a clear understanding of the state of matter produced in relativistic heavy ion collisions,it is vital to understand the space-time phenomenology,of the emitting source.Finally,we concluded that while gluon Wilson loops yield vanishing odd harmonics,quark Wilson loops can generate sizable odd harmonics for two particle correlations.Thus,by taking both quark and gluon channels into account,we found that the overall second and third harmonics lie approximately close to the recent PHENIX data at RHIC.