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First measurement of near-threshold J/psi exclusive photoproduction off the proton
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First measurement of near-threshold J/psi exclusive photoproduction off the proton
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We report on the measurement of the $\gamma p \rightarrow J/\psi p$ cross section from $E_\gamma = 11.8$ GeV down to the threshold at $8.2$ GeV using a tagged photon beam with the GlueX experiment. We find the total cross section falls toward the threshold less steeply than expected from two-gluon exchange models. The differential cross section $d\sigma /dt$ has an exponential slope of $1.67 \pm 0.39$ GeV$^{-2}$ at $10.7$ GeV average energy. The LHCb pentaquark candidates $P_c^+$ 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 $\mathcal{B}(P_c^+ \rightarrow J/\psi p)$ and cross sections $\sigma(\gamma p \to P_c^+)\times\mathcal{B}(P_c^+ \to J/\psi p) $.
Forward citations
Cited by 10 Pith papers
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Leading-twist convolution with small-x singular PDFs matches threshold J/ψ data but requires eikonal unitarization fitted to HERA to cover the full energy range, with the dispersive real part dominating near threshold.
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