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We present a full next-to-leading order (NLO) QCD corrections to diphotonproduction at the hadron colliders in both standard model and ADD model. Theinvariant mass and rapidity distributions of the diphotons are obtained using asemi-analytical two cut-off phase space slicing method which allows for asuccessful numerical implementation of various kinematical cuts used in theexperiments. The fragmentation photons are systematically removed usingsmooth-cone-isolation cuts on the photons. The NLO QCD corrections not onlystabilise the perturbative predictions but also enhance the production crosssection significantly.

Diphoton signals in theories with large extra dimensions to NLO QCD at hadron colliders