  The supersymmetric type II seesaw may leave a limit where a triplet boson
along with the standard Higgs boson remains light. Working in this limit with
small triplet vacuum expectation vlaues, we explore how much such a light
triplet boson can contribute to the Higgs boson decay to diphoton, and analyze
the feasibility to observe it through same-sign di-lepton and tetra-lepton
signals in the forthcoming LHC run after setting a LHC7 limit in a simplified
parameter space of the triplet vaccum expectation value and the doubly charged
boson mass.
