Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-02-25
JHEP 0205 (2002) 005
Physics
High Energy Physics
High Energy Physics - Phenomenology
32 pages, 10 figures, published version
Scientific paper
10.1088/1126-6708/2002/05/005
In the analysis of the total cross section for the gamma* gamma* -> hadrons process, we include the four parton final states, which are part of the O(alpha_s^2) corrections. The four-parton final states contain the diagrams with gluon exchange in the crossed channel, which constitute the leading order of the BFKL resummation. We show that the diagrams with gluon exchange in the crossed channel play an important role in the large Y region, however their contribution to the cross section must be evaluated exactly. In fact, the high-energy limit, which constitutes the kinematic framework of the BFKL resummation, is not sufficiently accurate at LEP2 energies. The inclusion of the diagrams with gluon exchange in the crossed channel reduces the discrepancy between the theory and the LEP2 data collected by the L3 Collaboration, but the data still lie above the theory, even allowing for a large scale uncertainty in the theory. Thus, in order to describe accurately the data for gamma* gamma* -> hadrons in the large Y region, corrections of an order higher than O(alpha_s^2) seem to be necessary.
Duca Vittorio Del
Maltoni Fabio
Trocsanyi Zoltan
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