| DATE: |
2005-10-12 11:00 - |
| PLACE: |
Kenkyu-Honkan 2F, RM 220 |
| TITLE: |
Four-fermion production at gamma gamma colliders |
| CONTACT: |
Tango |
| SPEAKER: |
Dr. A. Bredenstein (Max-Plank-Institut fur Physik) |
| LANGUAGE: |
English |
| ABSTRACT: |
A future $\gamma\gamma$ collider will be a true W-pair factory, rendering precision calculations for W-pair production very important for signal and background studies. In this seminar the {\cal O}($\alpha$) electroweak radiative corrections to $\gamma\gamma\to$ WW $\to 4f$ in the double-pole approximation (DPA) will be presented. In detail, virtual corrections are treated in DPA, leading to a classification into factorizable and non-factorizable contributions, and real-photonic corrections are based on complete lowest-order matrix elements for $\gamma\gamma\to 4f\gamma$. Soft and collinear singularities are combined using the dipole subtraction method or by applying phase-space slicing. The {\cal O}($\alpha$) corrections comprise resonant Higgs production $\gamma\gamma\to$ H $\to$ WW $\to4f$ which is of particular interest and should be described more accurately. As one ingredient first results on the complete {\cal O}($\alpha$) corrections to H $\to$ WW $\to 4f$ will be presented.
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