@article{3170642, title = "Measurement of t(t)over-bar production with additional jet activity, including b quark jets, in the dilepton decay channel using pp collisions at root s=8TeV", author = "Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. 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 Hartl, C. and Hoermann, N. and and Hrubec, J. and Jeitler, M. and Knuenz, V. and Koenig, A. and Krammer, M. and and Kraetschmer, I. and Liko, D. and Matsushita, T. and Mikulec, I. and and Rabady, D. and Rahbaran, B. and Rohringer, H. and Schieck, J. and and Schoefbeck, R. and Strauss, J. and Treberer-Treberspurg, W. and and Waltenberger, W. and Wulz, C-E and Mossolov, V. and Shumeiko, N. and and Gonzalez, J. Suarez and Alderweireldt, S. and Cornelis, T. and De Wolf, and E. 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H. and Taylor, D. and Woods, N. and and CMS Collaboration", journal = "The European Physical Journal C - Particles and Fields", year = "2016", volume = "76", number = "7", publisher = "Springer-Verlag", issn = "1434-6044, 1434-6052", doi = "10.1140/epjc/s10052-016-4105-x", abstract = "Jet multiplicity distributions in top quark pair (t (t) over bar) events are measured in pp collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC using a data set corresponding to an integrated luminosity of 19.7 fb(-1). The measurement is performed in the dilepton decay channels (e(+)e(-), mu(+)mu(-), and e(+/-)mu(+/-)). The absolute and normalized differential cross sections for t (t) over bar production are measured as a function of the jet multiplicity in the event for different jet transverse momentum thresholds and the kinematic properties of the leading additional jets. The differential t (t) over barb and t (t) over barb (b) over bar cross sections are presented for the first time as a function of the kinematic properties of the leading additional b jets. Furthermore, the fraction of events without additional jets above a threshold is measured as a function of the transverse momenta of the leading additional jets and the scalar sum of the transverse momenta of all additional jets. The data are compared and found to be consistent with predictions from several perturbative quantum chromodynamics event generators and a next-to-leading order calculation." }