Some vectorlike quarks are added to the Higgs triplet model with the motivation of fitting the recent Higgs boson data released by LHC and Tevatron collaborations. These vectorlike quarks can suppress the cross section of $gg\to h$ sizably, while the charged scalars, especially for the doubly charged scalar, can enhance $\mathrm{Br}(h\to \gamma \gamma )$ more sizably. Besides, the Higgs couplings to $WW$, $ZZ$, and light fermions can be the same as their standard model (SM) values. Thus, the model will enhance the Higgs production rates into $\gamma \gamma$ and $jj\gamma \gamma$, while those for $W{W}^{*}$, $Z{Z}^{*}$, and $\tau \overline{\tau }$ at the LHC are reduced relative to their SM predictions. The Higgs production rate into $Vb\overline{b}$ at the Tevatron is the same as the SM prediction.

• Received 14 June 2012

DOI:https://doi.org/10.1103/PhysRevD.86.095007