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We calculate loop-induced Higgs production and decay processes which arerelevant for the LHC in various six-dimensional Universal Extra Dimensionmodels. More concretely, we focus on Higgs production through gluon fusion andHiggs decay into two photons induced by loop diagrams. They are one-loopleading processes and the contribution of Kaluza-Klein particles is consideredto be significant. These processes are divergent in six dimensions. Therefore,we employ a momentum cutoff, whose size is fixed from the validity ofperturbative calculation through naive dimensional analysis. In thesesix-dimensional Universal Extra Dimension models, the Higgs production crosssection through gluon fusion strongly increases considerably and the Higgsdecay width into two photons decrease somehow. In particular in the case of thecompactification on Projective Sphere, these effects are remarkable. Thedeviation of the $h^{(0)} \rightarrow 2 \gamma$ signal from the prediction ofthe Standard model is much larger than that in the case of the five-dimensionalminimal UED model. We also consider threshold corrections in the two processesand these effect are noteworthy when we choose low cutoff scale in 6D UED.Comparing our calculation to the latest LHC results which were published at theLepton-Photon 2011 is performed briefly.

Higgs production and decay processes via loop diagrams in various 6D Universal Extra Dimension Models at LHC