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 inverse femtobarns. Using a procedure to associate jets to decay products of the top quarks, the differential cross section of the t t-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.
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Open access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License http://creativecomm ons.org/licenses/by/4.0/
1: at Vienna University of Technology, Vienna, Austria 2: at CERN, European Organization for Nuclear Research, Geneva, Switzerland 3: at Institut Pluridisciplinaire Hubert Curien, Université de Strasbourg, Université de Haute Alsace Mulhouse, CNRS/IN2P3, Strasbourg, France 4: at National Institute of Chemical Physics and Biophysics, Tallinn, Estonia 5: at Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia 6: at Universidade Estadual de Campinas, Campinas, Brazil 7: at California Institute of Technology, Pasadena, USA 8: at Laboratoire Leprince-Ringuet, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, France 9: at Suez University, Suez, Egypt 10: at Zewail City of Science and Technology, Zewail, Egypt 11: at Cairo University, Cairo, Egypt 12: at Fayoum University, El-Fayoum, Egypt 13: at Helwan University, Cairo, Egypt 14: at British University in Egypt, Cairo, Egypt 15: at Ain Shams University, Cairo, Egypt 16: at Université de Haute Alsace, Mulhouse, France 17: at Joint Institute for Nuclear Research, Dubna, Russia 18: at Brandenburg University of Technology, Cottbus, Germany 19: at The University of Kansas, Lawrence, USA 20: at Institute of Nuclear Research ATOMKI, Debrecen, Hungary 21: at Eötvös Loránd University, Budapest, Hungary 22: at Tata Institute of Fundamental Research-HECR, Mumbai, India 23: at King Abdulaziz University, Jeddah, Saudi Arabia 24: at University of Visva-Bharati, Santiniketan, India 25: at University of Ruhuna, Matara, Sri Lanka 26: at Isfahan University of Technology, Isfahan, Iran 27: at Sharif University of Technology, Tehran, Iran 28: at Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran 29: at Laboratori Nazionali di Legnaro dell’INFN, Legnaro, Italy 30: at Università degli Studi di Siena, Siena, Italy 31: at Centre National de la Recherche Scientifique (CNRS)-IN2P3, Paris, France 32: at Purdue University, West Lafayette, USA 33: at Universidad Michoacana de San Nicolas de Hidalgo, Morelia, Mexico 34: at National Centre for Nuclear Research, Swierk, Poland 35: at Institute for Nuclear Research, Moscow, Russia 36: at St. Petersburg State Polytechnical University, St. Petersburg, Russia 37: at Faculty of Physics, University of Belgrade, Belgrade, Serbia
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