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arXiv 2112.09451hep-ph
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在LHC和未来的线性对撞机上五重态费米子的替代签名

Alternative signatures of the quintuplet fermions at the LHC and future linear colliders

Nilanjana Kumar, Vandana Sahdev

摘要:

大的费米子多重态出现在标准模型(SM)的不同扩展中,它们对于预测小中微子质量、暗物质(DM)的残余丰度以及μ子反常磁矩(μ子(g-2))的测量值是必不可少的。包含费米子五重态($Σ$)的模型,以及其他标量多重态,可以解决最近在风味部门的异常,同时满足电弱物理的约束。在标准情况下,奇异的费米子直接与SM粒子耦合,并且它们的质量受到大型强子对撞机(LHC)等对撞机实验的强烈限制。在本文中,我们选择了一个特定的情况下,五重态费米子比标量,这是自然的动机从μ子(g-2)的数据。这些模型的一个独特之处在于,它们预测了对撞机上的非标准签名,因为五重态费米子一旦在对撞机上产生就会通过标量衰变。我们研究这些非标准的相互作用,并提供替代的搜索策略,这些外来费米子在大型强子对撞机和未来的线性对撞机(如$e^+e^-$对撞机)。我们还讨论了它们的排除和发现限制。对于双电荷五重态费米子($Σ^{\pm\pm}$),如果$M_Σ\leq 980$ GeV,则在14 TeV LHC上积分亮度为3000 fb $^{-1}$时,可能发现5 $σ$意义。对于单电荷五重态费米子($Σ^\pm$),这一发现在大型强子对撞机上具有挑战性,但在$M_Σ\leq 700$ GeV的$e^+e^-$对撞机上,在1000 fb的$^{-1}$光度下,可能会发现5个$σ$。

英文摘要:

Large fermionic multiplets appear in different extensions of the Standard Model (SM), which are essential to predict small neutrino masses, relic abundance of the dark matter (DM) and the measured value of muon anomalous magnetic moment (muon (g-2)). Models containing quintuplet of fermions ($Σ$), along with other scalar multiplets, can address recent anomalies in the flavor sector while satisfying the constraints from the electroweak physics. In standard scenarios, the exotic fermions couple with the SM particles directly and there exists a strong limit on their masses from collider experiments such as the Large Hadron Collider (LHC). In this paper, we choose a particular scenario where the quintuplet fermions are heavier than the scalars, which is naturally motivated from the muon (g-2) data. A unique nature of these models is that they predict non-standard signatures at the colliders as the quintuplet fermions decay via the scalars once produced at the colliders. We study these non-standard interactions and provide alternative search strategies for these exotic fermions at the LHC and future linear colliders (such as $e^+e^-$ colliders). We also discuss their exclusion and discovery limits. For the doubly charged quintuplet fermion ($Σ^{\pm\pm}$), discovery is possible with 5$σ$ significance at integrated luminosity of 3000 fb$^{-1}$ at 14 TeV LHC if $M_Σ\leq 980$ GeV. For the singly charged quintuplet fermion ($Σ^\pm$), the discovery is challenging at LHC but there might be a possibility of 5 $σ$ discovery with 1000 fb$^{-1}$ luminosity at $e^+e^-$ collider for $M_Σ\leq 700$ GeV.

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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