* Astronomy

Title: Higgs production and decay processes via loop diagrams in various 6D Universal Extra Dimension Models at LHC
Authors: Kenji Nishiwaki

We calculate loop-induced Higgs production and decay processes which are relevant for the LHC in various six-dimensional Universal Extra Dimension models. More concretely, we focus on Higgs production through gluon fusion and Higgs decay into two photons induced by loop diagrams. They are one-loop leading processes and the contribution of Kaluza-Klein particles is considered to be significant. These processes are divergent in six dimensions. Therefore, we employ momentum cutoff, whose size is fixed from the validity of perturbative calculation through naive dimensional analysis. In these models, the Higgs production cross section strongly increases considerably and the Higgs decay width is somehow reduced. Especially in the case of the compactification on Real Projective Plane, these effects are remarkable. We can put a bound on the inverse compactification radius by use of the recent Tevatron experimental data. The deviation of the h^{(0)}
ightarrow 2 \gamma signal from the prediction of the Standard model is much larger than that in the case of the five-dimensional minimal UED model.

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