  We demonstrate how to efficiently expand cross sections for color-singlet
production at hadron colliders around the kinematic limit of all final state
radiation being collinear to one of the incoming hadrons. This expansion is
systematically improvable and applicable to a large class of physical
observables. We demonstrate the viability of this technique by obtaining the
first two terms in the collinear expansion of the rapidity distribution of the
gluon fusion Higgs boson production cross section at next-to-next-to leading
order (NNLO) in QCD perturbation theory. Furthermore, we illustrate how this
technique is used to extract universal building blocks of scattering cross
section like the N-jettiness and transverse momentum beam function at NNLO.
