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A first search for same-sign WW production via double-parton scattering isperformed based on proton-proton collision data at a center-of-mass energy of 8TeV using dimuon and electron-muon final states. The search is based on theanalysis of data corresponding to an integrated luminosity of 19.7 fb$^{-1}$.No significant excess of events is observed above the expected single-partonscattering yields. A 95% confidence level upper limit of 0.32 pb is set on theinclusive cross section for same-sign WW production via the double-partonscattering process. This upper limit is used to place a 95% confidence levellower limit of 12.2 mb on the effective double-parton cross section parameter,closely related to the transverse distribution of partons in the proton. Thislimit on the effective cross section is consistent with previous measurementsas well as with Monte Carlo event generator predictions.

Constraints on the double-parton scattering cross section from same-sign W boson pair production in proton-proton collisions at $\sqrt{s} =$ 8 TeV