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Ali, A; Amaryan, M; Austregesilo, A; Baalouch, M; Barbosa, F; Barlow, J; Barnes, A; Barriga, E; Beattie, T D; Berdnikov, V V; Boer, M; Briscoe, W J; Brooks, W K; Cao, N; Chudakov, E; Cole, S; Cortes, O; Crede, V; Dalton, M M; Deur, A; Dobbs, S; Dolgolenko, A; Dotel, R; Dugger, M; Dzhygadlo, R; Ernst, A; Eugenio, P; Fegan, S; Foda, A M; Foote, J; Frye, J; Furletov, S; Gasparian, A; Gleason, C; Goetzen, K; Goncalves, A; Goryachev, V S; Guo, L; Hakobyan, H; Hamdi, A; Han, S; Hardin, J; Huber, G M; Hurley, A; Ireland, D G; Ito, M M; Jarvis, N S; Jones, R T; Kakoyan, V; Kamel, M; Kourkoumelis, C; Kuleshov, S; Kuznetsov, I; Larin, I; Lawrence, D; Li, H; Liu, B; Lolos, G J; Lyubovitskij, V; Mack, D; Marukyan, H; Matveev, V; McCaughan, M; Mitchell, R E; Mokaya, F; Nerling, F; Ostrovidov, A I; Pauli, P; Pedroni, R; Pentchev, L; Phelps, W; Pooser, E; Qin, N; Romanov, D; Romero, C; Salgado, C; Schumacher, R A; Shen, X; Shepherd, M R; Smith, E S; Sober, D I; Somov, A; Somov, S; Stevens, J R; Suresh, K; Tarasov, V; Taylor, S; Teymurazyan, A; Thiel, A; Vasileiadis, G; Wickramaarachchi, N; Williams, M; Xiao, T; Yang, Y; Zarling, J; Zhang, Z; Zhao, G; Zhou, Q; Zhou, X; Zihlmann, B
Physical review letters, 2019-Aug-16, Volume: 123, Issue: 7Journal Article
We report on the measurement of the γp→J/ψp cross section from E_{γ}=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 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 B(P_{c}^{+}→J/ψp) and cross sections σ(γp→P_{c}^{+})×B(P_{c}^{+}→J/ψp).
