Measurements of B →j /ψ at forward rapidity in p+p collisions at s =510 GeV

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We report the first measurement of the fraction of J/ψ mesons coming from B-meson decay (FB→J/ψ) in p+p collisions at s=510 GeV. The measurement is performed using the forward silicon vertex detector and central vertex detector at PHENIX, which provide precise tracking and distance-of-closest-approach determinations, enabling the statistical separation of J/ψ due to B-meson decays from prompt J/ψ. The measured value of FB→J/ψ is 8.1%±2.3%(stat)±1.9%(syst) for J/ψ with transverse momenta 0<pT<5 GeV/c and rapidity 1.2<|y|<2.2. The measured fraction FB→J/ψ at PHENIX is compared to values measured by other experiments at higher center of mass energies and to fixed-order-next-to-leading-logarithm and color-evaporation-model predictions. The bb cross section per unit rapidity [dσ/dy(pp→bb)] extracted from the obtained FB→J/ψ and the PHENIX inclusive J/ψ cross section measured at 200 GeV scaled with color-evaporation-model calculations, at the mean B hadron rapidity y=±1.7 in 510 GeV p+p collisions, is 3.63-1.70+1.92 μb. It is consistent with the fixed-order-next-to-leading-logarithm calculations.


  • C. Aidala
  • N. N. Ajitanand
  • Y. Akiba
  • R. Akimoto
  • J J Alexander
  • M. Alfred
  • K. Aoki
  • N Apadula
  • H. Asano
  • E. T. Atomssa
  • A. Attila
  • T. C. Awes
  • Carmen Ayuso
  • B. Azmoun
  • V. Babintsev
  • M Bai
  • X. Bai
  • B Bannier
  • K N Barish
  • S Bathe
  • V. Baublis
  • C. Baumann
  • S. Baumgart
  • A Bazilevsky
  • M. Beaumier
  • R Belmont
  • A Berdnikov
  • Y. Berdnikov
  • D Black
  • D. S. Blau
  • M. Boer
  • J S Bok
  • K Boyle
  • M L Brooks
  • J. Bryslawskyj
  • H Buesching
  • V. Bumazhnov
  • Christopher C. Butler
  • S. Butsyk
  • S. Campbell
  • C. Canoaroman
  • C. H. Chen
  • C Y Chi
  • M Chiu
  • I J Choi
  • J B Choi
  • P. Christiansen
  • A. Oskarsson
  • D. Silvermyr
  • E. Stenlund
  • PHENIX Collaboration
Enheter & grupper
Externa organisationer
  • Howard University
  • Los Alamos National Laboratory
  • University of Michigan
  • Stony Brook 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
  • Eötvös Loránd University
  • Oak Ridge National Laboratory
  • University of California, Riverside
  • University of Colorado
  • Vanderbilt University
  • Georgia State University
  • University of New Mexico
  • Columbia University
  • University of Illinois at Urbana-Champaign
  • Chonbuk National University

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Subatomär fysik
TidskriftPhysical Review D - Particles, Fields, Gravitation and Cosmology
StatusPublished - 2017 maj 1
Peer review utfördJa