Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-12-17
Phys.Rev. D67 (2003) 075015
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages, two minor typos corrected
Scientific paper
10.1103/PhysRevD.67.075015
We show how the problem of small neutrino masses and suppressed proton decay can be simultaneously resolved in 6-D universal extra dimension models (UED) with a low fundamental scale using extended gauge groups that contain the local $B-L$ symmetry. The extra space dimensions are compactified either on a $T^2/Z_2$ or $T^2/Z_2\times Z'_2$ orbifold depending on whether the full gauge group is $SU(2)_L\times U(1)_{I_{3R}}\times U(1)_{B-L}$ or $SU(2)_L\times SU(2)_{R}\times U(1)_{B-L}$. 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 $n\to 3 \nu$. An interesting consequence of the model is a possible two component picture for dark matter of the universe.
Mohapatra Rabindra N.
Pérez--Lorenzana Abdel
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