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Hadronic production of a Higgs boson in association with two jets at ...

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3.2. The cut-constructible parts 73++−−+−++−−++−+−−+−−+ − +− +(a) (b) (c)+−−+−+−−−−−+++++−+−+(d) (e) (f)Figure 3.2: As <strong>in</strong> the four-mass case three-mass boxes do not contribute to φ-MHVamplitudes. External particles are either; positive helicity gluons (solid black l<strong>in</strong>es)<strong>of</strong> which there can be an arbitrary number <strong>at</strong> any vertex, neg<strong>at</strong>ive helicity gluons(shown <strong>in</strong> green) <strong>of</strong> which there can be only <strong>two</strong> and one φ (dashed black l<strong>in</strong>e). Ineach configur<strong>at</strong>ion (a) − (f) we f<strong>in</strong>d th<strong>at</strong> whichever way we distribute the helicitieswe have <strong>at</strong> least one zero tree-level amplitude (highlighted by the red boxes).

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