Photons, neutrinos and large compact space dimensions

Details Photons, neutrinos and large compact space dimensions Photons, neutrinos and large compact space dimensions

2000-03-15

arxiv.org/abs/hep-ph/0003152v2

Phys.Rev. D62 (2000) 053013

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 3 figures LaTeX. Typos corrected

Scientific paper

10.1103/PhysRevD.62.053013

We compute the contribution of Kaluza-Klein graviton exchange to the cross section for photon-neutrino scattering. Unlike the usual situation where the virtual graviton exchange represents a small correction to a leading order electroweak or strong amplitude, in this case the graviton contribution is of the same order as the electroweak amplitude, or somewhat larger. Inclusion of the graviton contribution is not sufficient to allow high energy neutrinos to scatter from relic neutrinos in processes such as $\nu\bar{\nu}\to\gamma\gamma$, but the photon-neutrino decoupling temperature is substantially reduced.

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