Probing the Green-Schwarz Mechanism at the Large Hadron Collider

We investigate the phenomenology of new abelian gauge bosons, which we denote as X bosons, that suffer a mixed anomaly with the Standard Model, but are made selfconsistent by the Green-Schwarz mechanism. A distinguishing aspect of the resulting effective theory is the decay of X bosons into Standard Model gauge bosons, X → ZZ,WW, γZ. We compute the production cross-section of the X boson from vector boson fusion at the Large Hadron Collider. We study the pp → X → ZZ → 4l signal, and analyze the prospects of discovery. We argue that such a discovery could indirectly probe high energies, even up to the string scale.