Speaker
Dr
Maksim Nekrasov
(Institute for High Energy Physics)
Description
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 a per mille accuracy of the computations. A comparison of the outcomes with the exact solution demonstrates 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 a discrepancy of the NNLO approximation makes up a few per mille.
Primary author
Dr
Maksim Nekrasov
(Institute for High Energy Physics)
