Weak Scale Quantum Gravity Effects for $\gamma\gamma\to ZZ$ in the TeV   region
  We consider the effect of massive spin-2 gravitons that occur as Kaluza-Klein excitations of the graviton in a Weak scale Quantum Gravity scenario on the process $\gamma \gamma \to ZZ$, which in the Standard Model can proceed through loop diagrams. For a wide range of parameters, we show that the massive gravitons leave behind signatures that should be verifiable in a TeV scale scattering experiment. 
S.R.Choudhury, A.S.Cornell and G.C.Joshi