Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-06-20
PoS ACAT2010:085,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk given at 13th International Workshop on Advanced Computing and Analysis Techniques in Physics Research, ACAT2010, Februar
Scientific paper
We consider pair production and decay of fundamental unstable particles in the framework of a modified perturbation theory (MPT), which treats resonant contributions of unstable particles in the sense of distributions. The cross-section of the process is calculated within the NNLO of the MPT in a model that admits exact solution. Universal massless-particles contributions are taken into consideration. The calculations are carried out by means of FORTRAN code with double precision, which ensures per mille accuracy of computations. A comparison of the outcomes with the exact solution reveals an excellent convergence of the MPT series at the energies close to and above the maximum of the cross-section. Near the maximum of the cross-section the discrepancy of the NNLO approximation makes up a few per mille.
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