Journal
PHYSICAL REVIEW LETTERS
Volume 87, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.87.181802
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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 T-2/Z(2) orbifold, a discrete subgroup of the six-dimensional Lorentz group continues to forbid dangerous operators.
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