Measurement of the polarization of the Υ(1S) and Υ(2S) states in pp̄ collisions at s=1.96TeV

Made available in DSpace on 2022-04-28T20:45:30Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-10-31 Science and Technology Facilities Council We present a study of the polarization of the Υ(1S) and Υ(2S) states using a 1.3fb-1 data sample collected by the D0 experiment in 2002-2006 during run II of the Fermilab Tevatron Collider. We measure the polarization parameter α=(σT-2σL)/(σT+2σL), where σT and σL are the transversely and longitudinally polarized components of the production cross section, as a function of the transverse momentum (pTΥ) for the Υ(1S) and Υ(2S). Significant pTΥ-dependent longitudinal polarization is observed for the Υ(1S). A comparison with theoretical models is presented. © 2008 The American Physical Society. Universidad de Buenos Aires, Buenos Aires LAFEX Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro Universidade do Estado do Rio de Janeiro, Rio de Janeiro Universidade Federal do ABC, Santo André Instituto de Física Teórica Universidade Estadual Paulista, São Paulo University of Alberta, Edmonton, AB Simon Fraser University, Burnaby, BC York University, Toronto, ON McGill University, Montreal, QC University of Science and Technology of China, Hefei Universidad de los Andes, Bogotá Center for Particle Physics Charles University, Prague Czech Technical University, Prague Center for Particle Physics Institute of Physics Academy of Sciences of the Czech Republic, Prague Universidad San Francisco de Quito, Quito LPC Univ. Blaise Pascal CNRS/IN2P3, Clermont LPSC Université Joseph Fourier Grenoble 1 Institut National Polytechnique de Grenoble CPPM Aix-Marseille Université CNRS/IN2P3, Marseille LAL Univ. 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