Preprint / Particle Physics Phenomenology CERNTH2001308 JINRE22000292 hepph/0012080

An electroweak library for the calculation of EWRC to $e^{+}e^{} \to f\overline{f}$ within the CalcPHEP project

Bardin, Dimitri Yuri ; Kalinovskaya, L V ; Nanava, G

Pages: mult. p
Year: 2001

Abstract: We present a description of calculations of the electroweak amplitude for e+ e > t tbar process. The calculations are done within OMS renormalization scheme in two gauges: Rxi, which allows to explicitly control gauge invariance by examining cancellation of gauge parameters and search for gauge invariant subsets of diagrams; and in the unitary gauge as a crosscheck. The formulae derived are realized in a FORTRAN code which is being created within the framework of the project topfit successor of ZFITTER. We present a comprehensive comparison between topfit results for the light top with corresponding ZFITTER results for u ubar channel, as well as a preliminary comparison with existing in the world literature results.

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