@article{3178848, title = "Constraintson the double-parton scattering cross section from same-sign W boson pair production in proton-proton collisions at root s=8TeV", author = "Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Ambrogi, F. and and Asilar, E. and Bergauer, T. and Brandstetter, J. and Brondolin, E. and and Dragicevic, M. and Eroe, J. and Flechl, M. and Friedl, M. and and Fruehwirth, R. and Ghete, V. M. and Grossmann, J. and Hrubec, J. and and Jeitler, M. and Koenig, A. and Krammer, N. and Kraetschmer, I. and Liko, and D. and Madlener, T. and Mikulec, I. and Pree, E. and Rabady, D. and Rad, and N. and Rohringer, H. and Schieck, J. and Schoefbeck, R. and Spanring, M. and and Spitzbart, D. and Waltenberger, W. and Wittmann, J. and Wulz, C. -E. and and Zarucki, M. and Chekhovsky, V. and Mossolov, V. and Gonzalez, J. and Suarez and De Wolf, E. 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E. and Sturdy, J. and Zaleski, S. and and Brodski, M. and Buchanan, J. and Caillol, C. and Dasu, S. and Dodd, L. and and Duric, S. and Gomber, B. and Grothe, M. and Herndon, M. and Herve, and A. and Hussain, U. and Klabbers, P. and Lanaro, A. and Levine, A. and and Long, K. and Loveless, R. and Polese, G. and Ruggles, T. and Savin, A. and and Smith, N. and Smith, W. H. and Taylor, D. and Woods, N. and CMS and Collaboration", journal = "Journal of High Energy Physics", year = "2018", number = "2", publisher = "Springer-Verlag", issn = "1126-6708, 1029-8479", doi = "10.1007/JHEP02(2018)032", keywords = "Hadron-Hadron scattering (experiments)", abstract = "A first search for same-sign WW production via double-parton scattering is performed 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 the analysis of data corresponding to an integrated luminosity of 19.7 fb(-1). No significant excess of events is observed above the expected single-parton scattering yields. A 95% confidence level upper limit of 0.32 pb is set on the inclusive cross section for same-sign WW production via the double-parton scattering process. This upper limit is used to place a 95% confidence level lower limit of 12.2mb on the effective double-parton cross section parameter, closely related to the transverse distribution of partons in the proton. This limit on the effective cross section is consistent with previous measurements as well as with Monte Carlo event generator predictions." }