2017/09/30 by Arindam Das, P. S. Bhupal Dev, Rabindra N. Mohapatra · 1 citation
Physics and Astronomy · #hep-ph #hep-ex
paper · pdf · doi:10.1103/physrevd.97.015018
published as Phys. Rev. D 97, 015018 (2018) · 17 pages, 2 figures; journal version
arxiv created 2018/01/31 · arxiv updated 2018/02/01
We calculate the ratio Rℓℓ 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 Rℓℓ 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 WR 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.