Neutrino mass, proton decay and dark matter in TeV scale universal extra dimension models
Neutrino mass, proton decay and dark matter in TeV scale universal extra dimension models
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TeV 尺度通用额外维度模型中的中微子质量、质子衰变和暗物质
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发表时间：
2002
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通讯作者：
A. Pérez‐Lorenzana
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作者：
R. Mohapatra;A. Pérez‐Lorenzana
我们展示了如何在具有低基本尺度的6D通用额外维度模型（UED）中同时解决小中微子质量和抑制质子衰变的问题，使用包含局部$B\ensuremath{-}L$对称的扩展规范群。额外的空间维度在${T}^{2}{/Z}_{2}$或${T}^{2}{/Z}_{2}\ifmmode\times\else\texttimes\fi{}{Z}_{2}^{\ensuremath{'}}$轨道上被紧化，这取决于全规范群是${\mathrm{SU}(2)}_{L}\ifmmode\times\else\texttimes\fi{}{U(1)}_{{I}_{3R}}\ifmmode\times\else\texttimes\fi{}{U(1)}_{B\ensuremath{-}L}$还是${\mathrm{SU}(2)}_{L}\ifmmode\times\else\texttimes\fi{}{\mathrm{SU}(2)}_{R}\ifmmode\times\else\texttimes\fi{}{U(1)}_{B\ensuremath{-}L}.$。在这两种情况下，中微子质量被标准模型单重态中微子的适当轨道宇称分配所抑制，质子衰变率由于紧化留下的残余离散对称而被抑制。对于较低的基本尺度值，中子的主要衰变模式是$\stackrel{\ensuremath{\rightarrow}}{n}3\ensuremath{\nu}.$该模型的一个有趣的结果是宇宙暗物质可能的双组分图。
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 ${T}^{2}{/Z}_{2}$ or ${T}^{2}{/Z}_{2}\ifmmode\times\else\texttimes\fi{}{Z}_{2}^{\ensuremath{'}}$ orbifold depending on whether the full gauge group is ${\mathrm{SU}(2)}_{L}\ifmmode\times\else\texttimes\fi{}{U(1)}_{{I}_{3R}}\ifmmode\times\else\texttimes\fi{}{U(1)}_{B\ensuremath{-}L}$ or ${\mathrm{SU}(2)}_{L}\ifmmode\times\else\texttimes\fi{}{\mathrm{SU}(2)}_{R}\ifmmode\times\else\texttimes\fi{}{U(1)}_{B\ensuremath{-}L}.$ 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 $\stackrel{\ensuremath{\rightarrow}}{n}3\ensuremath{\nu}.$ An interesting consequence of the model is a possible two component picture for the dark matter of the universe.