arXiv subjects

G. Nanava

Publications and source records attributed to G. Nanava.

20 records · Page 2Linked to original sources

arXiv2002

Further study of the E+ E- --> F anti-F process with the aid of CalcPHEP system

In this paper we complete a description of calculation of the one-loop amplitude for e+e- -->f fbar process started in CERN-TH/2001-308. This study is performed within the framework of the project CalcPHEP. Here we add QED subsets of the one-loop diagrams and the soft-photon contribution. The formulae we derived are realized in two independent FORTRAN codes,eeffLib, which was written in an old fashioned way, i.e. manually, and another one, created automatically with an aid of s2n_f (symbols to numbers) software -- a part of CalcPHEP system. We present a comprehensive comparison between the two our codes as well as with the results existing in the world literature.

hep-ph↗

arXiv2001

An electroweak library for the calculation of EWRC to e+ e- --> f fbar within the CalcPHEP project

We present a description of calculations of the electroweak amplitude for e+ e- --> f fbar process. The calculations are done within the OMS (on-mass-shell) renormalization scheme in two gauges: in Rxi, which allows an explicit control of gauge invariance by examining cancellation of gauge parameters and search for gauge-invariant subsets of diagrams, and in the unitary gauge as a cross-check. The formulae we derived are realized in a FORTRAN code eeffLib, which is being created within the framework of the project CalcPHEP. We present a comprehensive comparison between eeffLib results for the light top with corresponding results of the well-known program ZFITTER for the u ubar channel, as well as a preliminary comparison with results existing in the world literature.

hep-ph↗