$\nu$-Two Higgs Doublet Model and its Collider Phenomenology

Abstract

Smallness of neutrino masses can be explained by introducing a tiny vacuum expectation value of an extra-Higgs doublet which couples to right-handed neutrinos ($N_R$). This situation is naturally realized in $\nu$-Two Higgs Doublet Model ($\nu$THDM), where a TeV-scale seesaw mechanism can work well. We investigate observable phenomenology of $\nu$THDM at LHC and ILC experiments. Charged Higgs boson ($H^{\pm }$) in $\nu$THDM is almost originated from the extra-Higgs doublet and its coupling strength to neutrinos are not small. Then this model induces rich phenomenology at the LHC, for example, when $m_{H^{\pm }}^{}<M_N$, observable charged tracks can be induced from long lived charged Higgs. On the other hand, when $m_{H^{\pm }}^{}>M_N$, right-handed neutrinos can be long-lived, and secondary vertices may be tagged at the LHC. The $\nu$THDM also predicts observable lepton number violating process at the ILC.

17 pages, 27 eps files

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