弱混合角与F理论中的质子稳定性GUT
Weak Mixing Angle and Proton Stability in F-theory GUT
摘要：
指出基于F理论的一类翻转SU（5）模型自然地解释了规范耦合统一。这是因为群SU（5）xU（1）_X嵌入SO（10）和E_8中。为了阻止4维和5维质子衰变过程，结构群应该是SU（3）或更小。除了一对希格斯粒子外，超重的{5_{-2}，5 *_2}类矢量粒子对也是不允许的，因为它们会引起不需要的5维质子衰变。我们构造了一个简单的全局F-理论模型考虑这些点。为了在大统一理论尺度下保持sin^2 θ_W^0 = 3/8，通量只在味膜上被打开。
英文摘要：
It is pointed out that a class of flipped SU(5) models based on F-theory naturally explains the gauge coupling unification. It is because the group SU(5) x U(1)_X is embedded in SO(10) and E_8. To prohibit the dimension 4 and 5 proton decay processes, the structure group should be SU(3) or smaller. Extra heavy vector-like pairs of {5_{-2},5*_2} except only one pair of Higgs should be also disallowed, because they could induce the unwanted dimension 5 proton decays. We construct a simple global F-theory model considering these points. To maintain sin^2 theta_W^0 = 3/8 at the GUT scale, the fluxes are turned-on only on the flavor branes.
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