  In this letter we suggest a natural spinor-helicity formalism for massless
fields in AdS${}_4$. It is based on the standard realization of the AdS${}_4$
isometry algebra $so(3,2)$ in terms of differential operators acting on
$sl(2,\mathbb{C})$ spinor variables. We start by deriving the AdS counterpart
of plane waves in flat space and then use them to evaluate simple scattering
amplitudes. Finally, based on symmetry arguments we classify all three-point
amplitudes involving massless spinning fields. As in flat space, we find that
the spinor-helicity formalism allows to construct additional consistent
interactions compared to approaches employing Lorentz tensors.

High Energy Physics - Theory