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Measurement of spin correlation between and antitop quarks produced in p¯p collisions at √s=1.96 TeV Public Deposited

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  • Measurement of spin correlation between top and antitop quarks produced in p(p)over-bar collisions at root s=1.96 TeV
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  • We present a measurement of the correlation between the spins of t and t quarks produced in proton– antiproton collisions at the Tevatron Collider at a center-of-mass energy of 1.96 TeV. We apply a matrix element technique to dilepton and single-lepton+jets final states in data accumulated with the D0 detector that correspond to an integrated luminosity of 9.7 fb⁻¹. The measured value of the correlation coefficient in the off-diagonal basis, 0ₒff = 0.89 ± 0.22 (stat + syst), is in agreement with the standard model prediction, and represents evidence for a top–antitop quark spin correlation difference from zero at a level of 4.2 standard deviations.
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  • Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., ... & Zivkovic, L. (2016). Measurement of spin correlation between top and antitop quarks produced in p¯p collisions at √s=1.96 TeV. Physics Letters B, 757, 199-206. doi:10.1016/j.physletb.2016.03.053
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  • 757
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  • We thank the staffs at Fermilab and collaborating institutions, and acknowledge support from the Department of Energy and National Science Foundation (United States of America); Alternative Energies and Atomic Energy Commission and National Center for Scientific Research/ National Institute of Nuclear and Particle Physics (France); Ministry of Education and Science of the Russian Federation, National Research Center "Kurchatov Institute" of the Russian Federation, and Russian Foundation for Basic Research (Russia); National Council for the Development of Science and Technology and Carlos Chagas Filho Foundation for the Support of Research in the State of Rio de Janeiro (Brazil); Department of Atomic Energy and Department of Science and Technology (India); Administrative Department of Science, Technology and Innovation(Colombia); National Council of Science and Technology (Mexico); National Research Foundation of Korea (Korea); Foundation for Fundamental Research on Matter (The Netherlands); Science and Technology Facilities Council and The Royal Society (United Kingdom); Ministry of Education, Youth and Sports (Czech Republic); Bundesministerium fur Bildung and Forschung (Federal Ministry of Education and Research) and Deutsche Forschungsgemeinschaft (German Research Foundation) (Germany); Science Foundation Ireland (Ireland); Swedish Research Council (Sweden); China Academy of Sciences and National Natural Science Foundation of China (China); and Ministry of Education and Science of Ukraine (Ukraine).
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