Radiative Corrections to $\gamma \gamma \to t\bar{t}$ in the Electroweak Standard Model

Abstract

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 $(\gamma \gamma \to H^{\ast }\to t\bar{t})$ the weak corrections are widely independent of the Higgs-boson mass.

22 pages, LaTeX (compressed, uuencoded), 20 figures as compressed uuencoded ps-files, complete ps-file available via anonymous ftp from ftp://ftp.physik.uni-wuerzburg.de/pub/preprint/WUE-ITP-95-017.ps

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• GRACE at ONE-LOOP: Automatic calculation of 1-loop diagrams in the electroweak theory with gauge parameter independence checks
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• Analytical results for $e^{+}{e}^{-}\to t\bar{t}$ and $\gamma \gamma \to t\bar{t}$ observables near the threshold up to the next-to-next-to-leading order of NRQCD
• Complete O(alpha) QED corrections to polarized Compton scattering
• Testing Technicolor Models in Top Quark Pair Production at High Energy Photon Colliders
• High energy behaviour of gamma gamma to f f(bar) processes in SM and MSSM
• Study of the single neutral top-pion production process at $\gamma \gamma$ collider
• Top Quarks at Photon Colliders
• Yukawa corrections to top pair production in photon-photon collision
• Top quark pair production and decay at a polarized photon collider
• One-loop electroweak radiative corrections to charged lepton pair production in photon-photon collisions
• QCD corrections to the production of $t\bar{t}\gamma$ at the ILC
• Analytically expanded and integrated results for massive fermion production in two-photon collisions and a high precision alpha_s determination
• The SUSY EW-like corrections to top pair production in photon-photon collisions
• SUSY QCD impact on top-pair production associated with a $Z^0$-boson at a photon-photon collider
• R-parity violation effect on the top-quark pair production at linear colliders