LHC上的$eejj$过量信号及其对Leptogenesis的限制
The $eejj$ Excess Signal at the LHC and Constraints on Leptogenesis
摘要：
我们回顾了非超对称（扩展）左右对称模型（LRSM）和基于低能量$E_6$的模型，以研究它们是否可以解释最近在CMS和leptogenesis检测到的过量$eejj$信号。$eejj$过剩可以用右手规范玻色子（$W_R$）的衰变来解释，在LRSM的某些变体中，质量为$\sim \rm{TeV}$（带有$g_{L}\neq g_{R}$）。然而，这样的场景不能容纳大规模的leptogenesis。其他的尝试是通过考虑LRSM背景下相对较大汤川耦合的共振纤体生成情景来解释纤体生成，同时保持$W_{R}$质量几乎在LHC的范围内。然而，这可能是不可行的，因为轻子不对称性会被某些过程冲掉。因此，我们考虑超弦启发的$E_{6}$模型的三个有效的低能子群，这些子群具有许多额外的奇异费米子，这提供了一个丰富的有待探索的唯象。然而，我们发现，这三个有效的低能量亚组的$E_6$也不能解释这两个$eejj$多余的信号和leptogenesis同时。
英文摘要：
We review the non-supersymmetric (Extended) Left-Right Symmetric Models (LRSM) and low energy $E_6$-based models to investigate if they can explain both the recently detected excess $eejj$ signal at CMS and leptogenesis. The $eejj$ excess can be explained from the decay of the right-handed gauge bosons ($W_R$) with mass $\sim \rm{TeV}$ in certain variants of the LRSM (with $g_{L}\neq g_{R}$). However such scenarios can not accommodate high-scale leptogenesis. Other attempts have been made to explain leptogenesis while keeping the $W_{R}$ mass almost within the reach of the LHC by considering the resonant leptogenesis scenario in the context of the LRSM for relatively large Yukawa couplings. However this may not be feasible due to washout of the lepton asymmetry by certain processes. Therefore we consider three effective low energy subgroups of the superstring inspired $E_{6}$ model having a number of additional exotic fermions which provides a rich phenomenology to be explored. We however find that these three effective low energy subgroups of $E_6$ too cannot explain both the $eejj$ excess signal and leptogenesis simultaneously.
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