Double Higgs production at LHC, see-saw type II and Georgi-Machacek   model
  The double Higgs production in the models with isospin-triplet scalars is studied. It is shown that in the see-saw type II model the mode with an intermediate heavy scalar, $pp\to H+X\to 2h+X$, may have the cross section which is compatible with that in the Standard Model. In the Georgi-Machacek model this cross section could be much larger than in SM since the vacuum expectation value of the triplet can be large. 
S.I. Godunov, M.I. Vysotsky, E.V. Zhemchugov
hep-ph hep-ex