Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-01-23
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 5 figures; contribution to "Sense of Beauty in Physics", Miniconference in Honor of Adriano Di Giacomo on his 70th B
Scientific paper
This paper is a brief survey of the Balitskii-Fadin-Kuraev-Lipatov (BFKL) approach for the description of hard or semi-hard processes in the so-called Regge limit of perturbative QCD. The starting point is a fundamental property of perturbative QCD, the gluon Reggeization. This property, combined with s-channel unitarity, allows to predict the growth in energy of the amplitude of hard or semi-hard processes with exchange of vacuum quantum numbers in the $t$-channel. When also the so-called impact factors of the colliding particles are known, then not only the behavior with the energy, but the complete amplitude can be determined. This was recently done, for the first time with next-to-leading order accuracy and for a process with colorless external particles, in the case of the electroproduction of two light vector mesons.
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