Abstract
The paper presents short historical reviews of the processes of lepton pairs production in peripheral interaction of leptons and ions at high energies. The orders of magnitude of the QED and QCD cross sections with the production of two and three jets are given. The technique of the analysis is described in detail based on the parameterization of Sudakov 4-momentum tasks and writing the amplitude in an explicit gaugeinvariant form.
Based on this formalism the differential cross sections of QCD processes \(gp \to (ggg)p;qp \to (q\bar QQ)p;gp \to (gQ\bar Q)P\) were obtained, including the distribution on transverse momentum component of jets fragments. It was shown that the role of the contribution of “non-Abelian” nature may become dominant in a particular kinematics of the final particles. The kinematics, in which the initial particle changes the direction of movement to the opposite one, was considered in the case of heavy quark-antiquark pair production.
In the appendices, the details of the calculations and the explicit form of the differential cross sections are given. Some extended comments on the frequently used cross sections of the pair production in the case of two-photon scattering are presented. In particular, the degree of the longitudinal polarization of the positron, the interaction polarized initial electron, was calculated. The method of calculating the cross sections of the 2 → 2 processes in QCD, based on the isolation of irreducible color structures and the method CALCUL of spiral amplitudes, was discussed in detail.
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Ahmadov, A.I., Kuraev, E.A. Jets production in peripheral interactions of high energy leptons, quarks, photons, and gluons with the proton. Phys. Part. Nuclei 45, 1033–1059 (2014). https://doi.org/10.1134/S1063779614060021
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DOI: https://doi.org/10.1134/S1063779614060021