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arXiv 0810.3871hep-ph
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具有第四类夸克的变味中性流

Flavor changing neutral currents with a fourth family of quarks

Johana A. Herrera, Richard H. Benavides, William A. Ponce

摘要:

对于一个模型的第四个家庭的夸克,新的来源的味道改变中性流面临的酉4x 4夸克混合矩阵与熟悉的3x 3夸克混合矩阵的实验测量值。作为实验约束的味道改变中性流的已知的界限,最大的混合的已知夸克与第四家族的建立。预测是:|V_{tb}|与单位衰变有显著不同的是,在大型强子对撞机上,t->cγ和t->cZ是最后一个可以达到的稀有顶衰变的大速率,而s->dγ和s->dg是稀有奇异衰变的大速率,其中g代表胶子场。

英文摘要:

For a model with a fourth family of quarks, new sources of flavor changing neutral currents are identified by confronting the unitary 4x4 quark mixing matrix with the experimental measured values of the familiar 3x3 quark mixing matrix. By imposing as experimental constraints the known bounds for the flavor changing neutral currents, the largest mixing of the known quarks with the fourth family ones is established. The predictions are: a value for |V_{tb}| significantly different from unity, large rates for rare top decays as t->cγand t->cZ, the last one reachable at the Large Hadrion Collider, and large rates for rare strange decays s->dγand s->dg, where g stands for the gluon field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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