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Description
The following project concerns investigation of strong forces governing interactions of fundamental constituents of matter: quarks and gluons and the underlying basic theory describing these interactions - Quantum Chromodynamics (QCD).We are especially interested in the so-called High Energy Physics (HEP), which involves experiments that collide hadrons accelerated to velocities close to the speed of light in large facilities. Hadrons are extremely complex systems formed by elementary quarks and gluons (partons) located in a region of space-time. The way these partons are distributed inside the hadrons typically needs to be determined experimentally, as the standard QCD tool the perturbation theory is inapplicable whereas the effective QCD models are not precise enough and hard to apply for barionic systems. Collisions of hadrons injected in accelerators give information on the dynamics of the strong interactions. In the present project we investigate particle production in proton-nucleus (pA) and proton-proton (pp) collisions in the small-x regime. The first part consists in the investigation of angular correlations between two particles produced in pA collisions. Our goal is to explain the related experimental data in terms of the basic theory and the CGC theory. The second objective aims to investigate the quantum interference contributions that exists in two particle production, which are neglected in general phenomenological analysis. We want to compute the scattering amplitudes using different existing formalisms and calculate the corresponding cross sections. The third objective attempts to connect the small-x physics and elastic scattering of hadrons.The idea is to study the proton-proton elastic scattering using microscopic models containing information of partonic distribution and quantum effects using the apparatus developed for small-x physics.