Revisiting coupling selection rules in heterotic orbifold models

Revisiting coupling selection rules in heterotic orbifold models
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重新审视杂种优势轨道模型中的耦合选择规则

DOI:
10.1007/jhep05(2012)008
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发表时间:
2012
影响因子:
5.4
通讯作者:
I. Zavala
I. Zavala
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
T. Kobayashi;S. L. Parameswaran;S. Ramos-Sanchez;I. Zavala

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利用共形场论研究了杂化轨道紧化中扭曲扇形场之间的L点耦合。选择规则提供了一种简单的方法来识别哪些耦合是非零的。目前文献中使用的是规范不变性,R-电荷守恒和空间群选择规则,但它们不是全部。我们恢复和完善的第四个选择规则,由于在底层环面晶格的对称性,并引入第五个,由于存在或不存在经典的世界表瞬子解决方案调解的耦合。我们认为简要的现象学后果的额外规则,特别是最近的orbifold建设的领域内容对应的MSSM。奇异质量矩阵的结构不变,许多5维质子衰变算子消失。
We study L-point couplings between twisted sector fields in heterotic orbifold compactifications, using conformal field theory. Selection rules provide an easy way to identify which couplings are non-vanishing. Those used in the current literature are gauge invariance, R-charge conservation and the space group selection rule, but they are not the whole story. We revive and refine a fourth selection rule, due to symmetries in the underlying torus lattice, and introduce a fifth one, due to the existence or not of classical worldsheet instanton solutions to mediate the couplings. We consider briefly the phenomenological consequences of the additional rules, in particular for recent orbifold constructions whose field content correspond to that of the MSSM. The structure of the exotic mass matrices is unaltered and many dimension-5 proton-decay operators vanish.
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