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preprints:2008:ttp08-20 [2016/03/17 11:03] (current)
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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]] ​  | 
 +| |