Publications
Publication Information
| Title | First measurement of near-threshold J/$\psi $ exclusive photoproduction off the proton |
| Authors | Ahmed Ali, Moskov Amaryan, Efstratios Anassontzis, Alexander Austregesilo, Marouen Baalouch, Fernando Barbosa, Jason Barlow, Alexander Barnes, Edmundo Barriga Ruiz, Tegan Beattie, Vladimir Berdnikov, Timothy Black, Werner Boeglin, Marie Boer, William Briscoe, Thomas Britton, William Brooks, Bradford Cannon, Nina Cao, Eugene Chudakov, Sebastian Cole, Olga Cortes Becerra, Volker Crede, Mark Dalton, T. Daniels, Alexandre Deur, Sean Dobbs, Alina Dolgolenko, Rupesh Dotel, Michael Dugger, Roman Dzhygadlo, Hovanes Egiyan, Ashley Ernst, Paul Eugenio, Cristiano Fanelli, Stuart Fegan, Ahmed Foda, J. Foote, John Frye, Sergey Furletov, Liping Gan, Ashot Gasparian, Viacheslav Gauzshtein, Nerses Gevorgyan, Colin Gleason, Klaus Goetzen, Angelica Goncalves Dos Santos, Vladimir Goryachev, Lei Guo, Hayk Hakobyan, Abdennacer Hamdi, Shuang Han, John Hardin, Garth Huber, Andrew Hurley, David Ireland, Mark Ito, Naomi Jarvis, R. Jones, Vanik Kakoyan, Grzegorz Kalicy, Mahmoud Kamel, Christine Kourkoumelis, Sergey Kuleshov, Ivan Kuznetsov, Ilya Larin, David Lawrence, Daniel Lersch, Hao Li, Li Wenliang, Baoting Liu, Kenneth Livingston, George Lolos, V. Lyubovitskij, David Mack, Hrachya Marukyan, Vladimir Matveev, Michael McCaughan, Michael McCracken, William McGinley, James McIntyre, Curtis Meyer, Rory Miskimen, Ryan Mitchell, Fridah Mokaya, Frank Nerling, Lawrence Ng, Alexander Ostrovidov, Zisis Papandreou, Maria Patsyuk, Peter Hurck, Ron Pedroni, Lubomir Pentchev, Klaus Peters, William Phelps, Eric Pooser, Nian Qin, Joerg Reinhold, Barry Ritchie, Luke Robison, Dmitry Romanov, Christian Romero Vieyra, Carlos Salgado, Amy Schertz, Reinhard Schumacher, Joachim Schwiening, Kamal Seth, X. Shen, Matthew Shepherd, Elton Smith, Daniel Sober, Alexander Somov, Sergey Somov, Orlando Soto Sandoval, J. Stevens, Igor Strakovsky, Karthik Suresh, V. Tarasov, S. Taylor, Aram Teymurazyan, Annika Thiel, Georgios Vasileiadis, Dominik Werthmueller, Timothy Whitlatch, Nilanga Wickramaarachchi, M. Williams, Ting Xiao, Yunjie Yang, Jonathan Zarling, Z. Zhang, Guangda Zhao, Q. Zhou, Xiang Zhou, Benedikt Zihlmann |
| JLAB number | JLAB-PHY-19-2946 |
| LANL number | arXiv:1905.10811 |
| Other number | DOE/OR/23177-4686 |
| Document Type(s) | (Journal Article) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Journal Compiled for Physical Review Letters Volume 123 Page(s) 072001 Refereed | |
| Publication Abstract: | 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) $. |
| Experiment Numbers: | E12-06-102 |
| Group: | Hall D |
| Document: | |
| DOI: | https://doi.org/10.1103/PhysRevLett.123.072001 |
| Accepted Manuscript: | 1905.10811.pdf |
| Supporting Documents: | |
| Supporting Datasets: | |