Like-charged W boson pair production at the LHC

The large parton flux at high energy gives rise to events where different pairs of parton interact contemporarily with large momentum exchange. We present the production of like-charged W boson pair through single and double parton scattering in hadron collisions. We point out that like-sign W pair production provides a clean way of searching for, and calibrating double parton scattering at the LHC.