arXiv 0705.06462007-05-04hep-th

Z_6'方向折叠上相交D6-branes的几乎超对称标准模型

Almost the supersymmetric Standard Model from intersecting D6-branes on the Z_6' orientifold

David Bailin, Alex Love

备注：: 8 pages, no figures
发表信息：: Phys.Lett.B651:324-328,2007; Erratum-ibid.B658:292-294,2008
DOI：: 10.1016/j.physletb.2007.06.042 10.1016/j.physletb.2007.11.014

摘要：

在Z_6'定向折叠上的超对称分数次膜的交叉堆叠可以用来构造超对称标准模型。如果a，b是产生SU（3）_{colour}和SU（2）_L规范粒子的堆，那么，为了得到{ \em just}，（超对称）标准模型（与Higgs多重态的非零Yukawa耦合），需要堆叠a和b的交叉点a \cap b的数量，并且a的交叉数a \cap b'与b的定向折叠图像b'满足（a \cap b，a \cap b '）=（2，1）或（1，2）。同样必要的是，在规范群的对称表象中没有物质，在反对称表象中也没有太多的物质。具有所有这些性质的分式膜可以在Z_6'定向折叠上构造。我们构建了一个（四层）模型，其中有两个额外的堆栈，每个堆栈只有一个膜，它具有精确的超对称标准模型的物质谱，包括一对希格斯双重态。然而，规范群是SU（3）_{ \rm colour} x SU（2）_L x U（1）_Y x U（1）_H。只有希格斯二重态相对于U（1）H是带电的。

英文摘要：

Intersecting stacks of supersymmetric fractional branes on the Z_6' orientifold may be used to construct the supersymmetric Standard Model. If a,b are the stacks that generate the SU(3)_{colour} and SU(2)_L gauge particles, then, in order to obtain {\em just} the chiral spectrum of the (supersymmetric) Standard Model (with non-zero Yukawa couplings to the Higgs mutiplets), it is necessary that the number of intersections a \cap b of the stacks a and b, and the number of intersections a \cap b' of a with the orientifold image b' of b satisfy (a \cap b,a \cap b')=(2,1) or (1,2). It is also necessary that there is no matter in symmetric representations of the gauge group, and not too much matter in antisymmetric representations, on either stack. Fractional branes having all of these properties may be constructed on the Z_6' orientifold. We construct a (four-stack) model with two further stacks, each with just a single brane, which has precisely the matter spectrum of the supersymmetric Standard Model, including a single pair of Higgs doublets. However, the gauge group is SU(3)_{\rm colour} x SU(2)_L x U(1)_Y x U(1)_H. Only the Higgs doublets are charged with respect to U(1)_H.

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