@article{3162646, title = "Measurement of jet multiplicity distributions in t(t)over-bar production in pp collisions at root s=7TeV", author = "Chatrchyan, S. and Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. and M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and and Eroe, J. and Fabjan, C. and Friedl, M. and Fruehwirth, R. and Ghete, V. and M. and Hartl, C. and Hoermann, N. and Hrubec, J. and Jeitler, M. and and Kiesenhofer, W. and Knuenz, V. and Krammer, M. and Kraetschmer, I. and and Liko, D. and Mikulec, I. and Rabady, D. and Rahbaran, B. and Rohringer, and H. and Schoefbeck, R. and Strauss, J. and Taurok, A. and and Treberer-Treberspurg, W. and Waltenberger, W. and Wulz, C-E. and and Mossolov, V. and Shumeiko, N. and Gonzalez, J. Suarez and Alderweireldt, and S. and Bansal, M. and Bansal, S. and Cornelis, T. and De Wolf, E. 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Kottachchi and Kankanamge and Lamichhane, P. and Belknap, D. A. and Borrello, L. and and Carlsmith, D. and Cepeda, M. and Dasu, S. and Duric, S. and Friis, E. and and Grothe, M. and Hall-Wilton, R. and Herndon, M. and Herve, A. and and Klabbers, P. and Klukas, J. and Lanaro, A. and Lazaridis, C. and Levine, and A. and Loveless, R. and Mohapatra, A. and Ojalvo, I. and Perry, T. and and Pierro, G. A. and Polese, G. and Ross, I. and Sarangi, T. and Savin, A. and and Smith, W. H. and Woods, N. and CMS Collaboration", journal = "The European Physical Journal C - Particles and Fields", year = "2014", volume = "74", number = "8", publisher = "Springer-Verlag", issn = "1434-6044, 1434-6052", doi = "10.1140/epjc/s10052-014-3014-0", abstract = "The normalised differential top quark-antiquark production cross section is measured as a function of the jet multiplicity in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC with the CMS detector. The measurement is performed in both the dilepton and lepton+jets decay channels using data corresponding to an integrated luminosity of 5.0 fb(-1). Using a procedure to associate jets to decay products of the top quarks, the differential cross section of the t (t) over bar production is determined as a function of the additional jet multiplicity in the lepton+jets channel. Furthermore, the fraction of events with no additional jets is measured in the dilepton channel, as a function of the threshold on the jet transverse momentum. The measurements are compared with predictions from perturbative quantum chromodynamics and no significant deviations are observed." }