Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-12-02
Int.J.Mod.Phys. A14 (1999) 1769-1788
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex file, 20 pages, no figures, corrected some typos
Scientific paper
10.1142/S0217751X99000907
We consider the Sudakov form factor in effective theories and we show that one can derive correctly the double logarithms of the original, high-energy, theory. We show that in effective theories it is possible to separate explicitely soft and hard dynamics being these two regimes related to velocity conserving and to velocity changing operators respectively. A new effective theory is sketched which extracts the leading collinear singularities of the full theory amplitudes. Finally, we show how all leading logarithmic effects in field theory can be obtained by means of simple effective theories, where they correspond to a renormalization effect.
Aglietti Ugo
Corbo` G.
Trentadue Luca
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