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| — | preprints:2008:ttp08-20 [2016/03/17 11:03] (current) – created - external edit 127.0.0.1 |
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| | ====== TTP08-20 Two-Loop Electroweak Corrections to the A^0\gamma\gamma and A^0gg Couplings of the CP-Odd Higgs Boson ====== |
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| | <hidden TTP08-20 Two-Loop Electroweak Corrections to the A^0\gamma\gamma and A^0gg Couplings of the CP-Odd Higgs Boson > Using the asymptotic-expansion technique, we compute the dominant |
| | two-loop electroweak corrections, of O(G_F m_t2), to production and |
| | decay via a pair of photons or gluons of the CP-odd Higgs boson A0 in a |
| | two-Higgs-doublet model with low- to intermediate values of the |
| | Higgs-boson masses and ratio tan(beta)=v_2/v_1 of the vacuum expectation |
| | values. We also study the influence of a sequential heavy-fermion |
| | generation. The appearance of three gamma_5 matrices in closed fermion |
| | loops requires special care in the dimensional regularisation of |
| | ultraviolet divergences. The finite renormalisation constant for the |
| | pseudoscalar current effectively restoring the anticommutativity of the |
| | gamma_5 matrix, familiar from perturbative quantum chromodynamics, is |
| | found not to receive a correction in this order. We also revisit the |
| | dominant two-loop electroweak correction to the H -> gamma gamma decay |
| | width in the standard model with a fourth fermion generation. |
| | </hidden> |
| | |**Joachim Brod, Frank Fugel, Bernd A. Kniehl** | |
| | |** Nucl. Phys. B807 188-209 2009 ** | |
| | | {{preprints:2008:ttp08-20.pdf|PDF}} {{preprints:2008:ttp08-20.ps|PostScript}} [[http://arxiv.org/abs/0807.1008|arXiv]] | |
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