The PHENIX experiment has measured the spin alignment for inclusive J/ψ→e+e- decays in proton-proton collisions at s=510 GeV at midrapidity. The angular distributions have been measured in three different polarization frames, and the three decay angular coefficients have been extracted in a full two-dimensional analysis. Previously, PHENIX saw large longitudinal net polarization at forward rapidity at the same collision energy. This analysis at midrapidity, complementary to the previous PHENIX results, sees no sizable polarization in the measured transverse momentum range of 0.0<pT<10.0 GeV/c. The results are consistent with a previous one-dimensional analysis at midrapidity at s=200 GeV. The transverse-momentum-dependent cross section for midrapidity J/ψ production has additionally been measured, and after comparison to world data, a simple logarithmic dependence of the cross section on s was found.
|Journal||Physical Review D|
|Publication status||Published - 2020 Oct 28|
Bibliographical noteFunding Information:
We thank the staff of the Collider-Accelerator and Physics Departments at Brookhaven National Laboratory and the staff of the other PHENIX participating institutions for their vital contributions. We acknowledge support from the Office of Nuclear Physics in the Office of Science of the Department of Energy; the National Science Foundation; Abilene Christian University Research Council; Research Foundation of SUNY; Dean of the College of Arts and Sciences, Vanderbilt University (United States); Ministry of Education, Culture, Sports, Science, and Technology and the Japan Society for the Promotion of Science (Japan); Conselho Nacional de Desenvolvimento Científico e Tecnológico and Fundação de Amparo à Pesquisa do Estado de São Paulo (Brazil); Natural Science Foundation of China (People’s Republic of China); Croatian Science Foundation and Ministry of Science and Education (Croatia); Ministry of Education, Youth and Sports (Czech Republic); Centre National de la Recherche Scientifique; Commissariat à l’Énergie Atomique; Institut National de Physique Nucléaire et de Physique des Particules (France); Bundesministerium für Bildung und Forschung; Deutscher Akademischer Austausch Dienst; Alexander von Humboldt Stiftung (Germany); J. Bolyai Research Scholarship; EFOP; the New National Excellence Program (ÚNKP); NKFIH; OTKA (Hungary); Department of Atomic Energy and Department of Science and Technology (India); Israel Science Foundation (Israel); Basic Science Research and SRC(CENuM) Programs through NRF funded by the Ministry of Education and the Ministry of Science and ICT (Korea); Physics Department, Lahore University of Management Sciences (Pakistan); Ministry of Education and Science; Russian Academy of Sciences; Federal Agency of Atomic Energy (Russia); VR and Wallenberg Foundation (Sweden); the U.S. Civilian Research and Development Foundation for the Independent States of the Former Soviet Union; the Hungarian American Enterprise Scholarship Fund; the US-Hungarian Fulbright Foundation; and the US-Israel Binational Science Foundation.
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics