Exotic Implications of Electron and Photon Final States

Details Exotic Implications of Electron and Photon Final States Exotic Implications of Electron and Photon Final States

2008-07-10

arxiv.org/abs/0807.1746v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures, table corrected and reference added

Scientific paper

New resonances with masses of order a few ${\rm TeV}$ might be discovered at the LHC. We show that no resonance that couples to electrons only through Standard Model interactions can decay to both $e^+e^-$and $\gamma \gamma$ with significant branching ratios. This means that finding both electron-positron and two-photon final states is evidence that electrons couple directly to the new physics associated with the resonance and furthermore that the resonance is not spin-1. The least fine-tuned such examples involve electron compositeness. One such example, Kaluza Klein excitations of the graviton in the version of the Randall Sundrum Model where Standard Model matter is located on the ${\rm TeV}$ brane, can be distinguished from other possibilities by its predicted branching fractions into the two modes.

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