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arXiv 0812.1698hep-phhep-ex
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顶夸克FCNC在LHC上产生的R宇称破坏效应

R-parity violating effects in top quark FCNC productions at LHC

Junjie Cao, Zhaoxia Heng, Lei Wu, Jin Min Yang

摘要:

在最小超对称模型中,顶夸克相互作用的R宇称破坏(迄今为止都是弱约束的)可以在大型强子对撞机(LHC)上诱导出各种不同的顶夸克变味中性流(FCNC)产生。在这项工作中,我们假设B-破坏耦合的存在,并检查他们的贡献FCNC生产过程中的部分子过程cg -> t,gg -> tc_bar,cg -> tγ,cg -> t Z和cg -> t h。我们发现,所有这些过程可以大大增强相对于R-奇偶保持预测。在当前实验所允许的参数空间中,除了cg ->t h之外的所有产生通道都可以达到3-sigma灵敏度,这与其中只有cg -> t可以达到3-sigma灵敏度的R-奇偶保持情况形成对比。

英文摘要:

In the minimal supersymmetric model the R-parity violating top quark interactions, which are so far weakly constrained, can induce various flavor-changing neutral-current (FCNC) productions for the top quark at the Large Hadron Collider (LHC). In this work we assume the presence of the B-violating couplings and examine their contributions to the FCNC productions proceeding through the parton processes cg -> t, gg -> t c_bar, cg -> tγ, cg -> t Z and cg -> t h. We find that all these processes can be greatly enhanced relative to the R-parity preserving predictions. In the parameter space allowed by current experiments, all the production channels except cg ->t h can reach the 3-sigma sensitivity, in contrast to the R-parity preserving case in which only cg -> t can reach the 3-sigma sensitivity.

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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