Feb 22 – 27, 2010
Jaipur, India
Europe/Zurich timezone

Unstable-particles pair production in modified perturbation theory in NNLO

Feb 26, 2010, 5:00 PM
25m
Jaipur, India

Jaipur, India

Jaipur, India
Parallel Talk Methodology of Computations in Theoretical Physics Friday, 26 February - Methodology of Computations in Theoretical Physics

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)

Presentation materials