Towards a Theory of Flavor from Orbifold GUTs
Towards a Theory of Flavor from Orbifold GUTs
复制标题
从 Orbifold GUT 走向风味理论
DOI：
10.1088/1126-6708/2004/09/026
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发表时间：
2001
影响因子：
5.4
通讯作者：
David R. Smith
中科院分区：
文献类型：
--
作者：
L. Hall;J. March;Takemichi Okui;David R. Smith
我们证明了最近构造的5维超对称S1/（Z2 × Z ′ 2）轨道大统一理论模型对夸克和轻子质量和混合角的层次结构给出了一个吸引人的解释.当场在不同的维数或不同的固定膜上传播时，一些耦合的几何抑制产生了味层次。在额外的维度中的局部性所产生的限制允许有趣的纹理零容易地生成。此外，SU（5）破缺轨道投影的细节性质导致了简单的理论，其中B − τ统一被保持，但类似的不利SU（5）关系自然避免了较轻的世代。我们发现基于S1/（Z2 × Z ′ 2）的简单5d模型在解释第二代和第三代粒子的质量和混合角的许多特征方面是非常成功的。包括中微子在内的成功的三代味模型
We show that the recently constructed 5-dimensional supersymmetric S 1 /(Z2 × Z ′ 2 ) orbifold GUT models allow an appealing explanation of the observed hierarchical structure of the quark and lepton masses and mixing angles. Flavor hierarchies arise from the geometrical suppression of some couplings when fields propagate in different numbers of dimensions, or on different fixed branes. Restrictions arising from locality in the extra dimension allow interesting texture zeroes to be easily generated. In addition the detailed nature of the SU(5)-breaking orbifold projections lead to simple theories where b − τ unification is maintained but similar disfavored SU(5) relations for the lighter generations are naturally avoided. We find that simple 5d models based on S 1 /(Z2 × Z ′ 2 ) are strikingly successful in explaining many features of the masses and mixing angles of the 2nd and 3rd generation. Successful three generation models of flavor including neutrinos