The $eejj$ Excess Signal at the LHC and Constraints on Leptogenesis

Abstract

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 $\sim \mathrm{TeV}$ in certain variants of the LRSM (with $g_L\ne g_R$). 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.

8 pages, 7 figures, revised version

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• Probing New Physics with Long-Range Neutrino Interactions: An Effective Field Theory Approach
• Sneutrino Higgs models explain lepton non-universality in CMS excesses
• How low-scale Trinification sheds light in the flavour hierarchies, neutrino puzzle, dark matter and leptogenesis
• Anatomy of Heavy Gauge Bosons in a Left-Right Supersymmetric Model