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Proton Stability in Six Dimensions

Thomas Appelquist, Bogdan A. Dobrescu, Eduardo Ponton, Ho-Ung Yee

hep-pharXiv:hep-ph/0107056

Abstract

We show that Lorentz and gauge invariance explain the long proton lifetime within the standard model in six dimensions. The baryon-number violating operators have mass dimension 15 or higher. Upon TeV-scale compactification of the two universal extra dimensions on a square T2/Z2 orbifold, a discrete subgroup of the 6-dimensional Lorentz group continues to forbid dangerous operators.

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