3 years ago

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

P. S. Bhupal Dev, Rabindra N. Mohapatra, Arindam Das

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.

Publisher URL: http://arxiv.org/abs/1709.06553

DOI: arXiv:1709.06553v3

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