2002/12/19 by R. N. Mohapatra, Abdel Pérez-Lorenzana, A. Perez-Lorenzana
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1103/physrevd.67.075015
published as Phys.Rev. D67 (2003) 075015 · 25 pages, two minor typos corrected
arxiv created 2002/12/19 · openalex publication_date 2003/04/23 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We show how the problem of small neutrino masses and suppressed proton decay can be simultaneously resolved in 6D universal extra dimension models (UED's) with a low fundamental scale using extended gauge groups that contain the local B\ensuremath-L symmetry. The extra space dimensions are compactified either on a T2/Z2 or T2/Z2\ifmmode×\else\texttimes\fiZ2^\ensuremath' orbifold depending on whether the full gauge group is SU(2)L\ifmmode×\else\texttimes\fiU(1)_I3R\ifmmode×\else\texttimes\fiU(1)_B\ensuremath-L or SU(2)L\ifmmode×\else\texttimes\fiSU(2)R\ifmmode×\else\texttimes\fiU(1)_B\ensuremath-L. In both cases, neutrino masses are suppressed by an appropriate orbifold parity assignment for the standard model singlet neutrinos and the proton decay rate is suppressed due to a residual discrete symmetry left over from compactification. For lower values of the fundamental scale, a dominant decay mode of the neutron is \stackrel\ensuremath→n3\ensuremathν. An interesting consequence of the model is a possible two component picture for the dark matter of the universe.