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Title: Vacuum stability in inert higgs doublet model with right-handed neutrinos

Journal Article · · Journal of High Energy Physics (Online)
 [1]; ORCiD logo [1];  [2];  [3]
  1. Indian Inst. of Technology (IIT), Telengana (India)
  2. Washington Univ., St. Louis, MO (United States). McDonnell Center for the Space Sciences. Dept. of Physics
  3. Indian Inst. of Technology (IIT), Delhi (India)

We analyze the vacuum stability in the inert Higgs doublet extension of the Standard Model (SM), augmented by right-handed neutrinos (RHNs) to explain neutrino masses at tree level by the seesaw mechanism. We make a comparative study of the high- and low-scale seesaw scenarios and the effect of the Dirac neutrino Yukawa couplings on the stability of the Higgs potential. Bounds on the scalar quartic couplings and Dirac Yukawa couplings are obtained from vacuum stability and perturbativity considerations. These bounds are found to be relevant only for low-scale seesaw scenarios with relatively large Yukawa couplings. The regions corresponding to stability, metastability and instability of the electroweak vacuum are identified. These theoretical constraints give a very predictive parameter space for the couplings and masses of the new scalars and RHNs which can be tested at the LHC and future colliders. The lightest non-SM neutral CP-even/odd scalar can be a good dark matter candidate and the corresponding collider signatures are also predicted for the model.

Research Organization:
Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0017987
OSTI ID:
1803204
Journal Information:
Journal of High Energy Physics (Online), Vol. 2020, Issue 8; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English

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