Studies Of Transverse Momentum Distribution Of Final-state Particles In High-energy Collisions Based On The CGC Framework

In high-energy collisions, gluon density inside nucleus grows rapidly when Bjorken x decreases, even tends to a saturation. In this case, non-linear effects become very important, and dynamical features are described by the Jalilian-Marian-Iancu-McLerran-Weigert-Leonidov-Kovner (JIMWLK) renormalization group equations. Especially, scattering amplitude with energy evolution is sat-isfied the Balitsky-Kovchegov (BK) equation. In this thesis, we systematically study of the scattering amplitude with energy evolution and calculate production of final-state particles in high-energy collisions. The main work is divided as fol-lows:Firstly, in framework of Color Glass Condensate (CGC), we mainly discuss the dynamical features in high-energy collisions,(a) By analyzing the evolu-tion of dynamical process in the deep inelastic scattering, the scattering ampli-tude with energy evolution (BK equation) is derived at leading logarithm accu-racy in the coordinate space,(b) We study the non-linear effects of BK equation which are caused by the gluon saturation. Results calculated by us show that the speed of the evolution is deduced if the running coupling effects is considered, as well as for the saturation scale,(c) For initial conditions of the BK equation, we obtained a new scattering amplitude (or named as Quartic Actiony which is involved "odd" and "quartic" contributions of valence color charges density. Nu-merical results show that the amplitude decrease sharply at very short distances. Comparing the results obtained by calculating transverse momentum distribution of hadrons with experimental data, we find that the saturation scale of the ini-tial condition should be a smaller one compared with Albacete-Armesto-Milhano-Quiroga-Salgado (AAMQS) if this coupling effects is considered. Secondly, in the framework of the CGC, we calculated the transverse momen-tum distribution of final-state particles. The results show that the solutions are well in agreement with experimental data in high-energy collisions. Furthermore, we obtained nuclear modification factor RpAch for charged hadrons produced in pro-ton-nucleus (pA) collisions at Large Hadron Collider (LHC) energy, and hope these predictions will meet to future experimental data at (?)=4.4TeV and8.8TeV.