Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-04-11
Int.J.Mod.Phys. A18 (2003) 5069-5098
Physics
High Energy Physics
High Energy Physics - Phenomenology
43 pages, 13 Encapsulated PostScript figures
Scientific paper
10.1142/S0217751X03015702
We consider the high energy behaviour of the amplitudes for pair production of charged leptons, quarks, Higgs bosons, sleptons, squarks and charginos at lepton colliders. We give the general expressions of the leading quadratic and subleading linear logarithms that appear at the one loop level, and derive the corresponding resummed expansions to \underline{subleading} logarithmic order accuracy. Under the assumption of a relatively light SUSY scenario and choosing the MSSM as a specific model, we compare the predictions of the one-loop and of the resummed expansions at variable energy. We show that the two predictions are very close in the one TeV regime, but drastically differ in the few ($2,3$) TeV range.
Beccaria Matteo
Melles Michael
Renard Fernand M.
Trimarchi Salvatore
Verzegnassi Claudio
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