arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1204.6599hep-ph
收藏

TeV-scale五重态费米子跷跷板

TeV-scale Seesaw with Quintuplet Fermions

Kresimir Kumericki, Ivica Picek, Branimir Radovcic

摘要:

我们提出了一个新的跷跷板模型,该模型基于费米子超荷零弱五重态与附加标量四重态的结合,从而得到了一个诱导的vev。该模型提供了树级跷跷板~ v^6/M^5和环抑制辐射~(1 / 16 π^2)v^2/M对活性中微子质量的贡献。实验质量m_v ~ 10^{-1} eV可以用M ~ TeV的新态来实现,在LHC上可以达到。在大型强子对撞机的5 fb^{-1}的积分亮度中,可能有大约500个双电荷的费米子或\bar{Σ^{++}}费米子,其质量M_E = 400 GeV,这导致了有趣的多轻子特征。费米子五重态的中性成分,以前被认为是最小的暗物质候选者,在拟议的跷跷板设置中变得不稳定。稳定性可以通过引入Z_2对称性来恢复,在这种情况下,中微子只从辐射贡献中获得质量。

英文摘要:

We propose a new seesaw model based on fermionic hypercharge zero weak quintuplet in conjunction with additional scalar quadruplet which attains an induced vev. The model provides both tree-level seesaw ~ v^6/M^5 and a loop-suppressed radiative ~ (1 / 16 π^2) v^2/M contributions to active neutrino masses. The empirical masses m_ν~ 10^{-1} eV can be achieved with M ~ TeV new states, accessible at the LHC. For 5 fb^{-1} of accumulated integrated luminosity at the LHC, there could be ~ 500 doubly-charged Σ^{++} or \bar{Σ^{++}} fermions with mass M_Σ= 400 GeV, leading to interesting multi-lepton signatures. The neutral component of the fermion quintuplet, previously identified as minimal dark matter candidate, becomes unstable in the proposed seesaw setup. The stability can be restored by introducing a Z_2 symmetry, in which case neutrinos get mass only from radiative contributions.

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。

↑