Signals for Low Scale Gravity in the Process $γγ\to ZZ$

Details Signals for Low Scale Gravity in the Process $γγ\to ZZ$ Signals for Low Scale Gravity in the Process $γγ\to ZZ$

2005-07-25

arxiv.org/abs/hep-ph/0507289v2

Phys.Rev. D72 (2005) 095007

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 8 figures

Scientific paper

We investigate the sensitivity of future photon-photon colliders to low scale gravity scenarios via the process $\gamma\gamma \to ZZ$ where the Kaluza-Klein boson exchange contributes only when the initial state photons have opposite helicity. We contrast this with the situation for the process $\gamma \gamma \to \gamma \gamma$ where the $t$ and $u$ channel also contribute. We include the one-loop Standard Model background whose interference with the graviton exchange determines the experimental reach in measuring any deviation from the Standard Model expectations and explore how polarization can be exploited to enhance the signal over background. We find that a 1 TeV linear collider has an experimental reach to mass scale of about 4 TeV in this channel.

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