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RS1中Kaluza-Klein胶子和夸克质量矩阵对变味中性流的约束

Flavour Changing Neutral Current Constraints from Kaluza-Klein Gluons and Quark Mass Matrices in RS1

We-Fu Chang, John N. Ng, Jackson M. S. Wu

备注：
v2: 23 pages, 1 figure. Typos corrected, references added. Discussions in Sec. III extended with clarifications, Additional appendix added
发表信息：
Phys.Rev.D79:056007,2009
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摘要：

我们继续我们以前的研究，什么是允许形式的夸克质量矩阵的Randall-Sundrum（RS）框架，可以重现实验观察到的夸克质量谱和CKM混合模式。我们研究了中性介子扇区中的$ΔF = 2$过程对那里的可接受形式的约束，我们发现只有非对称类型的夸克质量矩阵产生于无政府的汤川结构保持可行的几个TeV的规模在LHC可达到的。我们还研究了胶子的第一个Kaluza-Klein（KK）激发的衰变。我们给出了夸克对的衰变分支比，并指出，在占主导地位的$\bar{t}t$衰变中，对衰变宽度和夸克自旋之一的测量可以用来提取两种手征的第一KK胶子与顶夸克的有效耦合。这为RS框架的风味结构提供了进一步的探索。

英文摘要：

We continue our previous study on what are the allowed forms of quark mass matrices in the Randall-Sundrum (RS) framework that can reproduce the experimentally observed quark mass spectrum and the CKM mixing pattern. We study the constraints the $ΔF = 2$ processes in the neutral meson sector placed on the admissible forms found there, and we found only the asymmetrical type of quark mass matrices arising from anarchical Yukawa structures stay viable at the few TeV scale reachable at the LHC. We study also the decay of the first Kaluza-Klein (KK) excitation of the gluon. We give the decay branching ratios into quark pairs, and we point out that measurements of the decay width and just one of the quark spins in the dominant $\bar{t}t$ decays can be used to extract the effective coupling of the first KK gluon to top quarks for both chiralities. This provides further probe to the flavour structure of the RS framework.

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