Studies of X(3872) and psi(2S) production in p(p)over-bar collisions at 1.96 TeV

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No. of bitstreams: 0 Previous issue date: 2020-10-13 Fermi Research Alliance, LLC (FRA) Department of Energy (United States of America) National Science Foundation (United States of America) Alternative Energies and Atomic Energy Commission (France) National Center for Scientific Research/National Institute of Nuclear and Particle Physics (France) Ministry of Education and Science of the Russian Federation (Russia) National Research Center Kurchatov Institute of the Russian Federation (Russia) Russian Foundation for Basic Research (Russia) National Council for the Development of Science and Technology (Brazil) Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) Department of Atomic Energy (India) 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 (United Kingdom) Royal Society (United Kingdom) Ministry of Education, Youth and Sports (Czech Republic) Bundesministerium fur Bildung und Forschung (Federal Ministry of Education and Research) (Germany) Deutsche Forschungsgemeinschaft (German Research Foundation) (Germany) Science Foundation Ireland (Ireland) Swedish Research Council (Sweden) China Academy of Sciences (China) National Natural Science Foundation of China (China) Ministry of Education and Science of Ukraine (Ukraine) We present various properties of the production of the X(3872) and psi(2S) states based on 10.4 fb(-1) collected by the D0 experiment in Tevatron p (p) over bar collisions at root s = 1.96 TeV. For both states, we measure the nonprompt fraction f(NP) of the inclusive production rate due to decays of b-flavored hadrons. We find the f(NP) values systematically below those obtained at the LHC. The f(NP) fraction for psi(2S) increases with transverse momentum, whereas for the X(3872) it is constant within large uncertainties, in agreement with the LHC results. The ratio of prompt to nonprompt psi(2S) production, ( 1 - f(NP))/f(NP), decreases only slightly going from the Tevatron to the LHC, but for the X(3872), this ratio decreases by a factor of about 3. We test the soft-pion signature of the X(3872) modeled as a weakly bound charm-meson pair by studying the production of the X(3872) as a function of the kinetic energy of the X(3872) and the pion in the X(3872)pi center-of-mass frame. For a subsample consistent with prompt production, the results are incompatible with a strong enhancement in the production of the X(3872) at the small kinetic energy of the X(3872) and the pi in the X(3872)pi center-of-mass frame expected for the X + soft-pion production mechanism. For events consistent with being due to decays of b hadrons, there is no significant evidence for the soft-pion effect, but its presence at the level expected for the binding energy of 0.17 MeV and the momentum scale Lambda = M(pi) is not ruled out. 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