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A new model of physics, with a hidden conformal sector which manifests itselfas an unparticle coupling to Standard Model particles effectively throughhigher dimensional operators, predicts strong collider signals due tounparticle self-interactions. We perform a complete analysis of the mostspectacular of these signals at the hadron collider, pp -> 4photon and pp->2photon,2gluon. These processes can go through the three-point unparticleself interactions as well as through some s and t channel diagrams with oneand/or two unparticle exchanges. We study the contributions of individualdiagrams classified with respect to the number of unparticle exchanges anddiscuss their effect on the cross sections at the Tevatron and the LHC. We alsorestrict the Tevatron bound on the unknown coefficient of the three-pointunparticle correlator. With the availability of data from Tevatron, and theadvent of the data emerging from the LHC, these interactions can provide aclear and strong indication of unparticle physics and distinguish this modelfrom other beyond the standard model scenarios.

Collider Effects of Unparticle Interactions in Multiphoton Signals