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From the same journal

First Measurement of Near-Threshold J /ψ Exclusive Photoproduction off the Proton

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Author(s)

  • GlueX Collaboration
  • H. Hakobyan
  • A. Hamdi
  • S. Han
  • J. Hardin
  • G. M. Huber
  • A. Hurley,
  • D. G. Ireland,
  • M. M. Ito
  • N. S. Jarvis
  • R. T. Jones
  • V. Kakoyan
  • G. Kalicy
  • M Kamel
  • C. Kourkoumelis
  • S. Kuleshov
  • I Kuznetsov
  • I. Larin,
  • D Lawrence
  • D. I. Lersch
  • H. Li
  • W. Li
  • B. Liu
  • K. Livingston
  • G. J. Lolos
  • V. Lyubovitskij
  • D. Mack
  • H. Marukyan
  • V. Matveev
  • M. McCaughan
  • M. E. McCracken
  • W. McGinley
  • Jo McIntyre
  • C. A. Meyer
  • R. Miskimen
  • R. E. Mitchell
  • F. Mokaya
  • F. Nerling
  • L. Ng
  • A. I. Ostrovidov
  • Z. Papandreou
  • M. Patsyuk
  • P. Pauli
  • R. Pedroni
  • L. Pentchev
  • K. J. Peters
  • W. Phelps
  • E. Pooser
  • N. Qin
  • J. Reinhold
  • B G Ritchie
  • L. Robison
  • D. Romanov
  • C. Romero
  • C. Salgado
  • A. M. Schertz
  • R. A. Schumacher
  • J. Schwiening
  • K. K. Seth
  • X. Shen
  • M. R. Shepherd
  • E. S. Smith
  • D. I. Sober
  • A. Somov
  • S. Somov
  • O. Soto
  • J. R. Stevens
  • I. I. Strakovsky
  • K. Suresh
  • V. Tarasov
  • S. Taylor
  • A. Teymurazyan
  • A. Thiel
  • G. Vasileiadis
  • T. Whitlatch
  • N. Wickramaarachchi
  • M. Williams
  • T. Xiao
  • Y. Yang
  • J. Zarling
  • Z. Zhang
  • G. Zhao
  • Q Zhou
  • X. Zhou
  • B. Zihlmann

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Publication details

JournalPhysical Review Letters
DateAccepted/In press - 11 Jul 2019
DateE-pub ahead of print - 13 Aug 2019
DatePublished (current) - 16 Aug 2019
Issue number7
Volume123
Early online date13/08/19
Original languageEnglish

Abstract

We report on the measurement of the γp→J/ψp cross section from Eγ=11.8 GeV down to the threshold at 8.2 GeV using a tagged photon beam with the GlueX experiment. We find that the total cross section falls toward the threshold less steeply than expected from two-gluon exchange models. The differential cross section dσ/dt has an exponential slope of 1.67±0.39 GeV-2 at 10.7 GeV average energy. The LHCb pentaquark candidates Pc+ can be produced in the s channel of this reaction. We see no evidence for them and set model-dependent upper limits on their branching fractions B(Pc+→J/ψp) and cross sections σ(γp→Pc+)×B(Pc+→J/ψp).

Bibliographical note

© 2019 American Physical Society

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