The flavor-changing single-top quark production in the littlest Higgs model with T parity at the LHC
The flavor-changing single-top quark production in the littlest Higgs model with T parity at the LHC
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DOI：
10.1016/j.nuclphysb.2008.11.002
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发表时间：
2008-03
期刊：
影响因子：
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通讯作者：
Xue-lei Wang;Yanju Zhang;Huiling Jin;Yanhui Xi
中科院分区：
文献类型：
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作者：
Xue-lei Wang;Yanju Zhang;Huiling Jin;Yanhui Xi
具有离散对称性的最小希格斯模型称为“T-宇称”（LHT），是一种有趣的新物理模型，它不受电弱精度数据的强烈约束。 LHT模型的重要特征之一是SM费米子和镜像费米子之间存在新的FC相互作用源。这些 FC 相互作用可以对耦合 tcV 做出显着的环路级贡献，并进一步增强 FC 单顶夸克生产过程的横截面。在本文中，我们研究了 LHT 模型中 LHC 上的一些 FC 单顶夸克产生过程，pp{yields}tc-bar 和 pp{yields}tV。我们发现这些过程的横截面很大程度上取决于镜夸克质量。过程 pp{yields}tc-bar 和 pp{yields}tg 具有大横截面和重镜夸克。在大型强子对撞机上对这些FC过程的观察无疑是新物理学的线索，并且对横截面的进一步精确测量可以提供关于LHT模型中的自由参数的有用信息，特别是关于镜夸克质量的信息。
The littlest Higgs model with discrete symmetry named 'T-parity' (LHT) is an interesting new physics model which does not suffer strong constraints from electroweak precision data. One of the important features of the LHT model is the existence of new source of FC interactions between the SM fermions and the mirror fermions. These FC interactions can make significant loop-level contributions to the couplings tcV, and furthermore enhance the cross sections of the FC single-top quark production processes. In this paper, we study some FC single-top quark production processes, pp{yields}tc-bar and pp{yields}tV, at the LHC in the LHT model. We find that the cross sections of these processes strongly depend on the mirror quark masses. The processes pp{yields}tc-bar and pp{yields}tg have large cross sections with heavy mirror quarks. The observation of these FC processes at the LHC is certainly the clue of new physics, and further precise measurements of the cross sections can provide useful information about the free parameters in the LHT model, specially about the mirror quark masses.