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arXiv 1306.4113hep-phhep-ex
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解开标准模型; N=1和2代夸克:光谱、混合和对称性

Unlocking the Standard Model; N=1 and 2 generations of quarks : spectrum, mixing and symmetries

Bruno Machet

摘要:

利用复Higgs二重态和双线性夸克算符四重态之间的一一对应关系,将N=2代的Glashow-Salam-Weinberg模型推广到8个复合Higgs多重态.这是同时考虑可以由4个夸克构成的赝标介子和$W$规范玻色子的质量所需的最小数目。它们被用作输入,连同基本的低能量考虑,从中可以计算所有其他参数,质量和耦合。我们专注于这项工作的频谱上的8希格斯玻色子的混合角,并设置的“水平”和“垂直”纠缠对称性,手征$U(4)_L \times U(4)_R$组内,强烈的框架这种扩展的标准模型。特别地,$u-c$($θ_u$)和$d-s$($θ_d$)混合角满足鲁棒关系$\tan(θ_d+θ_u)\tan(θ_d-θ_u) = \Big(\frac{1}{m_{K^\pm}^2}-\frac{1}{m_{D^\pm}^2}\Big) \big/ \Big(\frac{1}{m_{π^\pm}^2}-\frac{1}{m_{D_s^\pm}^2}\Big)$。轻标量(低于$90 MeV$)出现,(至少)一个希格斯玻色子的质量增长到最重的$\bar qγ_5 q$束缚态的质量。$θ_u$不能安全地调整到零,并且几个参数在“小”参数如$m_π$或混合角方面没有可靠的扩展。这项研究并不需要额外的费米子。标量的有效耦合依赖于其动力学项的非平凡归一化,可能非常弱。为了(相对)简洁起见,他们丰富的非标准物理学(包括天体物理学)内容,包括第三代和量子校正的驯服都留给了后续工作。

英文摘要:

The Glashow-Salam-Weinberg model for N=2 generations is extended to 8 composite Higgs multiplets by using a one-to-one correspondence between its complex Higgs doublet and very specific quadruplets of bilinear quark operators. This is the minimal number required to suitably account, simultaneously, for the pseudoscalar mesons that can be built with 4 quarks and for the masses of the $W$ gauge bosons. They are used as input, together with elementary low energy considerations, from which all other parameters, masses and couplings can be calculated. We focus in this work on the spectrum of the 8 Higgs bosons, on the mixing angles, and on the set of "horizontal" and "vertical" entangled symmetries that, within the chiral $U(4)_L \times U(4)_R$ group, strongly frame this extension of the Standard Model. In particular, the $u-c$ ($θ_u$) and $d-s$ ($θ_d$) mixing angles satisfy the robust relation $\tan(θ_d+θ_u)\tan(θ_d-θ_u) = \Big(\frac{1}{m_{K^\pm}^2}-\frac{1}{m_{D^\pm}^2}\Big) \big/ \Big(\frac{1}{m_{π^\pm}^2}-\frac{1}{m_{D_s^\pm}^2}\Big)$. Light scalars (below $90 MeV$) arise and the mass of (at least) one of the Higgs bosons grows like that of the heaviest $\bar qγ_5 q$ bound state. $θ_u$ cannot be safely tuned to zero and several parameters have no reliable expansion in terms of "small" parameters like $m_π$ or the mixing angles. This study does not call for extra species of fermions. The effective couplings of scalars, which depend on the non-trivial normalization of their kinetic terms, can be extremely weak. For the sake of (relative) brevity, their rich content of non-standard physics (including astrophysics), the inclusion of the 3rd generation and the taming of quantum corrections are left for a subsequent work.

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