Similarity between Kaluza-Klein and Open-string amplitudes in Diphoton Production
Piyabut Burikham
Abstract
We calculate the tree-level open-string amplitudes for the scattering of four massless particles with diphoton final states. These amplitudes are required to reproduce those of standard model at the tree level in the low energy limit. After low energy stringy corrections, we found that they have similar form to the same processes induced by exchange of the Kaluza-Klein(KK) excitations of graviton in ADD scenario. Using this similarity, we apply constraints on the KK mass scale MD to the string scale MS. The results are consistent with constraints from the 4-fermion scattering, about 0.6-0.9 TeV.
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