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

A. Ali et al. (GlueX Collaboration)
Phys. Rev. Lett. 123, 072001 – Published 13 August 2019
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Abstract

We report on the measurement of the γpJ/ψp cross section from Eγ=11.8GeV 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±0.39GeV2 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(γpPc+)×B(Pc+J/ψp).

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  • Figure
  • Received 28 May 2019
  • Revised 5 July 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.072001

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Particles & FieldsNuclear Physics

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Vol. 123, Iss. 7 — 16 August 2019

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