Angular decay coefficients of J /ψ mesons at forward rapidity from p+p collisions at s =510 GeV

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We report the first measurement of the full angular distribution for inclusive J/ψ→μ+μ- decays in p+p collisions at s=510 GeV. The measurements are made for J/ψ transverse momentum 2<pT<10 GeV/c and rapidity 1.2<y<2.2 in the Helicity, Collins-Soper, and Gottfried-Jackson reference frames. In all frames the polar coefficient λθ is strongly negative at low pT and becomes close to zero at high pT, while the azimuthal coefficient λφ is close to zero at low pT, and becomes slightly negative at higher pT. The frame-independent coefficient λ is strongly negative at all pT in all frames. The data are compared to the theoretical predictions provided by nonrelativistic quantum chromodynamics models.


  • A Adare
  • C. Aidala
  • N. N. Ajitanand
  • Y. Akiba
  • R. Akimoto
  • M. Alfred
  • V. Andrieux
  • K. Aoki
  • N Apadula
  • Y Aramaki
  • H. Asano
  • E. T. Atomssa
  • T. C. Awes
  • Carmen Ayuso
  • B. Azmoun
  • V. Babintsev
  • M Bai
  • N. S. Bandara
  • B Bannier
  • K N Barish
  • S Bathe
  • A Bazilevsky
  • M. Beaumier
  • S. Beckman
  • R Belmont
  • A Berdnikov
  • Y. Berdnikov
  • D Black
  • D. S. Blau
  • M. Boer
  • J S Bok
  • E. K. Bownes
  • K Boyle
  • M L Brooks
  • J. Bryslawskyj
  • H Buesching
  • V. Bumazhnov
  • Christopher C. Butler
  • S. Campbell
  • V. Canoa Roman
  • R. Cervantes
  • C. H. Chen
  • C Y Chi
  • M Chiu
  • I J Choi
  • J B Choi
  • T. Chujo
  • Z. Citron
  • A. Oskarsson
  • D. Silvermyr
  • PHENIX Collaboration
External organisations
  • Howard University
  • University of Colorado
  • University of Michigan
  • Stony Brook University
  • Columbia University
  • RIKEN Nishina Center for Accelerator-Based Science
  • Brookhaven National Laboratory
  • University of Tokyo
  • High Energy Accelerator Research Organization, Tsukuba
  • Iowa State University
  • Kyoto University
  • Oak Ridge National Laboratory
  • University of Massachusetts
  • University of California, Riverside
  • Los Alamos National Laboratory
  • Georgia State University
  • University of Illinois at Urbana-Champaign
  • Chonbuk National University
  • University of Tsukuba
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Article number092003
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number9
Publication statusPublished - 2017 May 1
Publication categoryResearch