Factorization of double parton scattering: The double Drell-Yan process

With the center of mass energy of particle colliders becoming higher and higher multiparton interactions (MPIs) become ever more import and are highly relevant for the LHC. The basis for reliably describing these events based on first principles is built by extending the QCD factorization formalism to multiparton interactions. One of the most important tasks is to show that contributions due to exchange of Glauber gluons cancel in the sum over all diagrams. In this work we make a contribution to this effort by proving cancellation of Glauber gluon exchange at the one gluon exchange level for the double Drell-Yan process. In doing so, we also review some of the progress made in establishing factorization for MPIs in the last years and indicate how this proof can be extended to all orders in perturbation theory