For the particular form of the Yang–Mills–Higgs equations given above, the potential V ( ϕ ϕ ) is vanishing. Another common choice is V ( ϕ ϕ ) = 1 2 m 2 ⟨ ⟨ ϕ ϕ , ϕ ϕ ⟩ ⟩ , corresponding to a massive Higgs field.