Higgs - Two Photon Decay: QCD radiative correction

Abstract

QCD radiative correction to Higgs $\rightarrow$ two photons decay rate is calculated. Below the threshold we found negligible correction, thus supporting results obtained earlier by Djouadi et all [7]. Above the threshold radiative correction appears to be large for both real and imaginary part of H $\gamma \gamma$ vertex. This leads to radiative correction for $\Gamma $(H $\rightarrow \gamma \gamma $) to be of order 20--100 percents at $m_{t}=150 GeV$. Possible applications of our results for Higgs search at Next Linear Colliders (NLC) are briefly discussed.