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arXiv 1104.2046hep-ph
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SU(5)xSU(5)重新统一

SU(5)xSU(5) unification revisited

David Emmanuel-Costa, Edison T. Franco, Ricardo Gonzalez Felipe

摘要:

在极小超对称SU(5)xSU(5)框架中重新讨论了大统一的思想。结果表明,规范耦合统一成一个独特的耦合常数,可以实现在高能尺度与质子衰变约束兼容。这需要在中间能量尺度下添加最小的粒子含量。特别是,在(15,1)+(\bar{15},1)表示中引入SU(2)_L三重态,以及在(24,1)表示中引入标量三重态E_3和八重态E_8,对统一化是至关重要的。这些中间粒子的质量可以在很宽的范围内变化,甚至在TeV区域内。相反,奇异的类矢量费米子必须足够重,质量超过10^10 GeV。我们还表明,如果SU(5)xSU(5)理论被嵌入到一个杂化弦的情况下,它是不可能实现规范耦合统一与引力在微扰弦尺度。

英文摘要:

The idea of grand unification in a minimal supersymmetric SU(5)xSU(5) framework is revisited. It is shown that the unification of gauge couplings into a unique coupling constant can be achieved at a high-energy scale compatible with proton decay constraints. This requires the addition of a minimal particle content at intermediate energy scales. In particular, the introduction of the SU(2)_L triplets belonging to the (15,1)+(\bar{15},1) representations, as well as of the scalar triplet Σ_3 and octet Σ_8 in the (24,1) representation, turns out to be crucial for unification. The masses of these intermediate particles can vary over a wide range, and even lie in the TeV region. In contrast, the exotic vector-like fermions must be heavy enough and have masses above 10^10 GeV. We also show that, if the SU(5)xSU(5) theory is embedded into a heterotic string scenario, it is not possible to achieve gauge coupling unification with gravity at the perturbative string scale.

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