Type-II seesaw scalar triplet model at a 100 TeV pp collider: discovery and higgs portal coupling determination
Yong Du (Amherst Center for Fundamental Interactions, Physics Department, University of Massachusetts Amherst, Amherst, MA, 01003, U.S.A.); Aaron Dunbrack (Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY, 11790, U.S.A.); Michael Ramsey-Musolf (Amherst Center for Fundamental Interactions, Physics Department, University of Massachusetts Amherst, Amherst, MA, 01003, U.S.A., Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, CA, 91125, U.S.A.); Jiang-Hao Yu (CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, P.R. China, Amherst Center for Fundamental Interactions, Physics Department, University of Massachusetts Amherst, Amherst, MA, 01003, U.S.A., School of Physical Sciences, University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing, 100049, P.R. China)
We investigate the collider phenomenology of the scalar triplet particles in the Type-II seesaw model at a 100 TeV pp collider. Depending on triplet vacuum expectation value v Δ, the dominant discovery channels could be H ++ H −− and H ±± H ∓. We find the H ±± H ∓ → W ± W ± hW ∓ /ℓ ± ℓ ± hW ∓ channels are promising for both model discovery at relatively large v Δ and determination of the Higgs portal couplings λ 4 and λ 5. We also find that these two channels are complementary to indirect determination of λ 4 from future precise measurements on h → γγ decay rate. Together with pair production of the doubly-charged Higgs subsequently decaying into same-sign di-leptons, the H ±± H ∓ channels have the potential to cover a significant portion of the parameter space of the Type-II seesaw complex scalar triplet model.
