Same Sign versus Opposite Sign Dileptons as a Probe of Low Scale Seesaw Mechanisms

Abstract

We calculate the ratio $R_{\ell \ell }$ of same sign (SS) to opposite sign (OS) dileptons in type I and generalized inverse seesaw models and show that it can be anywhere between 0 and 1 depending on the detailed texture of the right-handed neutrino mass matrix. Measurement of $R_{\ell \ell }$ in hadron colliders can therefore provide a way to probe the nature of seesaw mechanism and also to distinguish between the two types of seesaw mechanisms. We work within the framework of left-right symmetric model as an example. We emphasize that coherence of the final states in the $W_R$ decay is crucial for this discussion and it requires the right-handed neutrinos to be highly degenerate. We isolate the range of parameters in the model where this effect is observable at the LHC and future colliders.

17 pages, 2 figures; journal version

References in corpus (9)

• Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass Generation
• Search for heavy neutrinos and W bosons with right-handed couplings in proton-proton collisions at sqrt(s) = 8 TeV
• First Limits on Left-Right Symmetry Scale from LHC Data
• Heavy neutrinos and the $pp\to lljj$ CMS data
• Neutrino Jets from High-Mass $W_R$ Gauge Bosons in TeV-Scale Left-Right Symmetric Models
• Resonant CP Violation due to Heavy Neutrinos at the LHC
• Lepton Number Violation and W' Chiral Couplings at the LHC
• Quasi-Dirac neutrinos at the LHC
• Do charged leptons oscillate?

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