Studies 3D Feature Of Two-gluon Correlations In Pp Collisions Based On The CGC Framework

In the standard model of particle physics,quarks and gluons are called partons with"color",together with the nucleon,Quantum Chromodynamic(QCD)is a gauge theory that describes the interaction between them.The lepton-nucleon deep inelastic scattering experiment(DIS)shows that the parton density inside the nucleon will change with the increase of the energy(the decrease of Bjorken x),especially the density of the gluons will increase rapidly with the increase of energy.However,the recombination effect of the gluons in the limited phase space will prevent the gluon density increases.In the end,the number of gluons will be saturated.The gluonic in the unit phase space shows a new form of matter that is order in short and disorder on the long time which is called Color Glass Condensate(CGC).The theory of this state of material is called the CGC effective field theory(EFT).The Color Glass Condensate(CGC)theory is an effective theory based on QCD,which describes the interaction between partons of the gluon saturation region at the high energy limit.It can make a unified description of the inclusive,exclusive production of particles and interparticle correlations for high energy collisions,which coincide with the corresponding experimental results,and the theory itself is still developing.The experimental results on pp,pA and AA collisions at the Large Hadron Collider(LHC)and the Relativistic Heavy Ion Collider(RHIC)shows that two particles correlations in the long-range rapidity correlation,near-side(??=0)and away-side(??=?)angular correlation appear Ridge structure.The long-range rapidity correlation is CGC initial effect from high-energy collisions or final flow?The research in this area will be significant for us to understand the mechanism of particle production and related dynamic mechanism in high-energy collisions.In CGC EFT,the nonlinear effect caused by gluon saturation in small x physical process can be described consistently by CGC EFT.(large x is the color source glue and the small x is the standard gauge field A?.The gauge field A? can be obtained by solving the classical Yang-Mills equation.In the large Nc approximation,the field A? follows the rcBK equation with the evolution of energy or x.)In our previous study,the reasons for the formation of the Ridge phenomenon have been revealed,and in the related literature it has been found that in the azimuth direction:Glasma graph contributes the same size at near-side(??=0)and away-side(??=?),and BFKL graph contributes only to away-side(??=?).The overall contributions in the azimuth direction are in good agreement with the experimental results.Based on the CGC EFT framework,this paper mainly studies the characteristics of the azimuth correlation of two gluons and the characteristics of the two particle correlation under the contribution of glasma graph,which mainly include the following aspects:First,we introduce the results of the two gluon correlation calculation framework under the CGC EFT framework and the relationship between the two gluons long range rapidity.Then we study the dependence of the azimuth correlation on the transverse mo-mentum and the rapidity.The results show that in the two gluon correlation,the selection of the transverse momentum is related to the saturation momentum Qs of the collision nu-cleus.When the transverse momentum of two gluons is p(?)?|QsA+QsB|?1.8 GeV/c,the corresponding correlation strength is strongest,and when we study the azimuth corre-lation,we find that when at least one gluon is in the small x region,the selection of the transverse momentum is at the p(?)?2Qsp=1.8 GeV/c and selects more finer trans-verse momentum bins,there are also bump,double peaks,shoulders structures.Such bump,double peaks,and shoulders(later called fine structure),which are directly related to the unintegral gluon distribution function of the collision nuclei.Secondly,we study the characteristics of two gluon associated 3D graphs.In front of us,we introduce the correlation of two gluons long range rapidity and azimuth an-gle respectively,but these analysis only introduce their respective characteristics in the direction of individual rapidity and azimuth angle.Now we will further introduce the three-dimensional distribution of the two gluons correlation in ?y,?? respectively.First,under the framework of CGC effective theory,we first introduce the three dimensional distribution algorithm of two gluons correlation.In order to ensure the correctness of the calculation,and to verify it,the results of our calculation will be compared with the results introduced before and the related experimental results.Through the comparison of these systems,we will show that those results are CGC theories that can be described and inter-preted,and those results can not be explained for the time being and further illustrate the consistency and correctness of the CGC theory.