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arXiv 1306.1275hep-ph
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具有电荷为-4/3和5/3的手征夸克模型

A Model with Chiral Quarks of Electric Charges -4/3 and 5/3

Alexandre Alves, E. Ramirez Barreto, D. A. Camargo, A. G. Dias

摘要:

我们提出了一个基于SU(3)xSU(2)xU(1)对称性的新模型,其中存在一组新的相容手征费米子场,使得模型没有异常。新的费米子并不具有标准模型中常见的家族结构,其中一些还带有奇异的电荷,比如夸克X和Y的电荷分别为5/3和-4/3。有趣的是,该模型包含了一个新的重中性轻子,它可能是一个暗物质的候选者。在我们的结构中存在两个希格斯双峰,因此在模型粒子谱中存在两个CP偶标量。其中一个类似于标准模型的希格斯玻色子,而另一个主要与新的奇异费米子耦合。我们进行了一个发现分析表明,8 TeV的大型强子对撞机可以找到Y夸克从单和对生产质量从300 GeV到750 GeV。我们还表明,新的频谱并没有显着贡献的斜EW参数,和危险的味道改变中性电流被抑制。从其他新的费米子在模型中的特征签名也进行了评论。

英文摘要:

We present a new model based on the SU(3)xSU(2)xU(1) symmetry, in which there is a new consistent set of chiral fermion fields that renders the model free from anomalies. The new fermions do not share the usual family structure of the Standard Model and some of them have exotic electric charges, as the quarks X and Y with electric charge 5/3 and -4/3, respectively. Interestingly, the model contains a new heavy neutral lepton which may be a dark matter candidate. Two Higgs doublets are present in our construction, so that two CP even scalars are present in the model particle spectrum. One of them is similar to Standard Model Higgs boson, while the other one couples mainly with the new exotic fermions. We performed a discovery analysis showing that the 8 TeV LHC can find the Y quark from single and pair production with masses from 300 GeV up to ~ 750 GeV. We also show that the new spectrum does not contribute significantly to the oblique EW parameters, and that dangerous flavor changing neutral currents are suppressed. Characteristic signatures from the other new fermions in the model are also commented.

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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