Radiative Corrections to $γγ\to t \bar t$ in the Electroweak Standard Model

Details Radiative Corrections to $γγ\to t \bar t$ in the Electroweak Standard Model Radiative Corrections to $γγ\to t \bar t$ in the Electroweak Standard Model

1995-07-21

arxiv.org/abs/hep-ph/9507372v1

Phys.Rev.D53:44-54,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, LaTeX (compressed, uuencoded), 20 figures as compressed uuencoded ps-files, complete ps-file available via anonymous

Scientific paper

10.1103/PhysRevD.53.44

The cross-section for $\gamma\gamma\to t \bar t$ with arbitrary polarized photons is calculated within the electroweak Standard Model including the complete virtual and soft-photonic $O(\alpha)$ corrections. We present a detailed numerical discussion of the radiative corrections with particular emphasis on the purely weak corrections. These are usually of the order of 1--10\% for energies up to 1 TeV. For unpolarized or equally polarized photons they reach almost 10\% close to threshold. The large corrections cannot be traced back to a universal origin like the running of $\alpha$ or the $\rho$-parameter. Apart from the energy region around the Higgs resonance $(\gamma\gamma\to H^*\to t\bar t)$ the weak corrections are widely independent of the Higgs-boson mass.

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