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

GlueX Collaboration

Research output: Contribution to journalArticle

2 Citations (Scopus)

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).

Original languageEnglish
Article number072001
JournalPhysical Review Letters
Volume123
Issue number7
DOIs
Publication statusPublished - 13 Aug 2019

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photoproduction
thresholds
protons
cross sections
photon beams
slopes
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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

In: Physical Review Letters, Vol. 123, No. 7, 072001, 13.08.2019.

Research output: Contribution to journalArticle

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title = "First Measurement of Near-Threshold J /ψ Exclusive Photoproduction off the Proton",
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).",
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AU - GlueX Collaboration

AU - Ali, A.

AU - Amaryan, M.

AU - Anassontzis, E. G.

AU - Austregesilo, A.

AU - Baalouch, M.

AU - Barbosa, F.

AU - Barlow, J.

AU - Barnes, A.

AU - Barriga, E.

AU - Beattie, T. D.

AU - Berdnikov, V. V.

AU - Black, T.

AU - Boeglin, W.

AU - Boer, M.

AU - Briscoe, W. J.

AU - Britton, T.

AU - Brooks, W. K.

AU - Cannon, B. E.

AU - Cao, N.

AU - Chudakov, E.

AU - Cole, S.

AU - Cortes, O.

AU - Crede, V.

AU - Dalton, M. M.

AU - Daniels, T.

AU - Deur, A.

AU - Dobbs, S.

AU - Dolgolenko, A.

AU - Dotel, R.

AU - Dugger, M.

AU - Dzhygadlo, R.

AU - Egiyan, H.

AU - Ernst, A.

AU - Eugenio, P.

AU - Fanelli, C.

AU - Fegan, S.

AU - Foda, A. M.

AU - Foote, J.

AU - Frye, J.

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AU - Gan, L.

AU - Gasparian, A.

AU - Gauzshtein, V.

AU - Gevorgyan, N.

AU - Gleason, C.

AU - Goetzen, K.

AU - Goncalves, A.

AU - Goryachev, V. S.

AU - Guo, L.

AU - Lyubovitskij, V.

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N2 - 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).

AB - 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).

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JO - Physical Review Letters

JF - Physical Review Letters

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