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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 $$\gamma p \rightarrow J/\psi p$$ 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 $$\sigma(\gamma p \to P_c^+)\times\mathcal{B}(P_c^+ \to J/\psi p) $$.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); George Washington Univ., Washington, DC (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); German Research Foundation (DFG); Natural Sciences and Engineering Research Council of Canada (NSERC); Russian Foundation for Basic Research; UK Science and Technology Facilities Council; National Natural Science Foundation of China (NNSFC)
Contributing Org.:
GlueX Collaboration
OSTI Identifier:
1574399
Alternate Identifier(s):
OSTI ID: 1557358; OSTI ID: 1594370
Report Number(s):
JLAB-PHY-19-2946; DOE/OR/23177-4686; arXiv:1905.10811
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:  
AC05-06OR23177; SC0016583
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 7; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Ali, A., Amaryan, M., Anassontzis, E. G., Austregesilo, A., Baalouch, M., Barbosa, F., Barlow, J., Barnes, A., Barriga, E., Beattie, T. D., Berdnikov, V. V., Black, T., Boeglin, W., Boer, M., Briscoe, W. J., Britton, T., Brooks, W. K., Cannon, B. E., Cao, N., Chudakov, E., Cole, S., Cortes, O., Crede, V., Dalton, M. M., Daniels, T., Deur, A., Dobbs, S., Dolgolenko, A., Dotel, R., Dugger, M., Dzhygadlo, R., Egiyan, H., Ernst, A., Eugenio, P., Fanelli, C., Fegan, S., Foda, A. M., Foote, J., Frye, J., Furletov, S., Gan, L., Gasparian, A., Gauzshtein, V., Gevorgyan, N., 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., Kalicy, G., Kamel, M., Kourkoumelis, C., Kuleshov, S., Kuznetsov, I., Larin, I., Lawrence, D., Lersch, D. I., Li, H., Li, W., Liu, B., Livingston, K., Lolos, G. J., Lyubovitskij, V., Mack, D., Marukyan, H., Matveev, V., McCaughan, M., McCracken, M., McGinley, W., McIntyre, J., Meyer, C. A., Miskimen, R., Mitchell, R. E., Mokaya, F., Nerling, F., Ng, L., Ostrovidov, A. I., Papandreou, Z., Patsyuk, M., Pauli, P., Pedroni, R., Pentchev, L., Peters, K. J., Phelps, W., Pooser, E., Qin, N., Reinhold, J., Ritchie, B. G., Robison, L., Romanov, D., Romero, C., Salgado, C., Schertz, A. M., Schumacher, R. A., Schwiening, J., Seth, K. K., Shen, X., Shepherd, M. R., Smith, E. S., Sober, D. I., Somov, A., Somov, S., Soto, O., Stevens, J. R., Strakovsky, I. I., Suresh, K., Tarasov, V., Taylor, S., Teymurazyan, A., Thiel, A., Vasileiadis, G., Werthmüller, D., Whitlatch, T., Wickramaarachchi, N., Williams, M., Xiao, T., Yang, Y., Zarling, J., Zhang, Z., Zhao, G., Zhou, Q., Zhou, X., and Zihlmann, B. First Measurement of Near-Threshold J/ψ Exclusive Photoproduction off the Proton. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.123.072001.
Ali, A., Amaryan, M., Anassontzis, E. G., Austregesilo, A., Baalouch, M., Barbosa, F., Barlow, J., Barnes, A., Barriga, E., Beattie, T. D., Berdnikov, V. V., Black, T., Boeglin, W., Boer, M., Briscoe, W. J., Britton, T., Brooks, W. K., Cannon, B. E., Cao, N., Chudakov, E., Cole, S., Cortes, O., Crede, V., Dalton, M. M., Daniels, T., Deur, A., Dobbs, S., Dolgolenko, A., Dotel, R., Dugger, M., Dzhygadlo, R., Egiyan, H., Ernst, A., Eugenio, P., Fanelli, C., Fegan, S., Foda, A. M., Foote, J., Frye, J., Furletov, S., Gan, L., Gasparian, A., Gauzshtein, V., Gevorgyan, N., 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., Kalicy, G., Kamel, M., Kourkoumelis, C., Kuleshov, S., Kuznetsov, I., Larin, I., Lawrence, D., Lersch, D. I., Li, H., Li, W., Liu, B., Livingston, K., Lolos, G. J., Lyubovitskij, V., Mack, D., Marukyan, H., Matveev, V., McCaughan, M., McCracken, M., McGinley, W., McIntyre, J., Meyer, C. A., Miskimen, R., Mitchell, R. E., Mokaya, F., Nerling, F., Ng, L., Ostrovidov, A. I., Papandreou, Z., Patsyuk, M., Pauli, P., Pedroni, R., Pentchev, L., Peters, K. J., Phelps, W., Pooser, E., Qin, N., Reinhold, J., Ritchie, B. G., Robison, L., Romanov, D., Romero, C., Salgado, C., Schertz, A. M., Schumacher, R. A., Schwiening, J., Seth, K. K., Shen, X., Shepherd, M. R., Smith, E. S., Sober, D. I., Somov, A., Somov, S., Soto, O., Stevens, J. R., Strakovsky, I. I., Suresh, K., Tarasov, V., Taylor, S., Teymurazyan, A., Thiel, A., Vasileiadis, G., Werthmüller, D., Whitlatch, T., Wickramaarachchi, N., Williams, M., Xiao, T., Yang, Y., Zarling, J., Zhang, Z., Zhao, G., Zhou, Q., Zhou, X., & Zihlmann, B. First Measurement of Near-Threshold J/ψ Exclusive Photoproduction off the Proton. United States. doi:10.1103/PhysRevLett.123.072001.
Ali, A., Amaryan, M., Anassontzis, E. G., Austregesilo, A., Baalouch, M., Barbosa, F., Barlow, J., Barnes, A., Barriga, E., Beattie, T. D., Berdnikov, V. V., Black, T., Boeglin, W., Boer, M., Briscoe, W. J., Britton, T., Brooks, W. K., Cannon, B. E., Cao, N., Chudakov, E., Cole, S., Cortes, O., Crede, V., Dalton, M. M., Daniels, T., Deur, A., Dobbs, S., Dolgolenko, A., Dotel, R., Dugger, M., Dzhygadlo, R., Egiyan, H., Ernst, A., Eugenio, P., Fanelli, C., Fegan, S., Foda, A. M., Foote, J., Frye, J., Furletov, S., Gan, L., Gasparian, A., Gauzshtein, V., Gevorgyan, N., 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., Kalicy, G., Kamel, M., Kourkoumelis, C., Kuleshov, S., Kuznetsov, I., Larin, I., Lawrence, D., Lersch, D. I., Li, H., Li, W., Liu, B., Livingston, K., Lolos, G. J., Lyubovitskij, V., Mack, D., Marukyan, H., Matveev, V., McCaughan, M., McCracken, M., McGinley, W., McIntyre, J., Meyer, C. A., Miskimen, R., Mitchell, R. E., Mokaya, F., Nerling, F., Ng, L., Ostrovidov, A. I., Papandreou, Z., Patsyuk, M., Pauli, P., Pedroni, R., Pentchev, L., Peters, K. J., Phelps, W., Pooser, E., Qin, N., Reinhold, J., Ritchie, B. G., Robison, L., Romanov, D., Romero, C., Salgado, C., Schertz, A. M., Schumacher, R. A., Schwiening, J., Seth, K. K., Shen, X., Shepherd, M. R., Smith, E. S., Sober, D. I., Somov, A., Somov, S., Soto, O., Stevens, J. R., Strakovsky, I. I., Suresh, K., Tarasov, V., Taylor, S., Teymurazyan, A., Thiel, A., Vasileiadis, G., Werthmüller, D., Whitlatch, T., Wickramaarachchi, N., Williams, M., Xiao, T., Yang, Y., Zarling, J., Zhang, Z., Zhao, G., Zhou, Q., Zhou, X., and Zihlmann, B. Tue . "First Measurement of Near-Threshold J/ψ Exclusive Photoproduction off the Proton". United States. doi:10.1103/PhysRevLett.123.072001.
@article{osti_1574399,
title = {First Measurement of Near-Threshold J/ψ Exclusive Photoproduction off the Proton},
author = {Ali, A. and Amaryan, M. and Anassontzis, E. G. and Austregesilo, A. and Baalouch, M. and Barbosa, F. and Barlow, J. and Barnes, A. and Barriga, E. and Beattie, T. D. and Berdnikov, V. V. and Black, T. and Boeglin, W. and Boer, M. and Briscoe, W. J. and Britton, T. and Brooks, W. K. and Cannon, B. E. and Cao, N. and Chudakov, E. and Cole, S. and Cortes, O. and Crede, V. and Dalton, M. M. and Daniels, T. and Deur, A. and Dobbs, S. and Dolgolenko, A. and Dotel, R. and Dugger, M. and Dzhygadlo, R. and Egiyan, H. and Ernst, A. and Eugenio, P. and Fanelli, C. and Fegan, S. and Foda, A. M. and Foote, J. and Frye, J. and Furletov, S. and Gan, L. and Gasparian, A. and Gauzshtein, V. and Gevorgyan, N. and Gleason, C. and Goetzen, K. and Goncalves, A. and Goryachev, V. S. and Guo, L. and Hakobyan, H. and Hamdi, A. and Han, S. and Hardin, J. and Huber, G. M. and Hurley, A. and Ireland, D. G. and Ito, M. M. and Jarvis, N. S. and Jones, R. T. and Kakoyan, V. and Kalicy, G. and Kamel, M. and Kourkoumelis, C. and Kuleshov, S. and Kuznetsov, I. and Larin, I. and Lawrence, D. and Lersch, D. I. and Li, H. and Li, W. and Liu, B. and Livingston, K. and Lolos, G. J. and Lyubovitskij, V. and Mack, D. and Marukyan, H. and Matveev, V. and McCaughan, M. and McCracken, M. and McGinley, W. and McIntyre, J. and Meyer, C. A. and Miskimen, R. and Mitchell, R. E. and Mokaya, F. and Nerling, F. and Ng, L. and Ostrovidov, A. I. and Papandreou, Z. and Patsyuk, M. and Pauli, P. and Pedroni, R. and Pentchev, L. and Peters, K. J. and Phelps, W. and Pooser, E. and Qin, N. and Reinhold, J. and Ritchie, B. G. and Robison, L. and Romanov, D. and Romero, C. and Salgado, C. and Schertz, A. M. and Schumacher, R. A. and Schwiening, J. and Seth, K. K. and Shen, X. and Shepherd, M. R. and Smith, E. S. and Sober, D. I. and Somov, A. and Somov, S. and Soto, O. and Stevens, J. R. and Strakovsky, I. I. and Suresh, K. and Tarasov, V. and Taylor, S. and Teymurazyan, A. and Thiel, A. and Vasileiadis, G. and Werthmüller, D. and Whitlatch, T. and Wickramaarachchi, N. and Williams, M. and Xiao, T. and Yang, Y. and Zarling, J. and Zhang, Z. and Zhao, G. and Zhou, Q. and Zhou, X. and Zihlmann, B.},
abstractNote = {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) $.},
doi = {10.1103/PhysRevLett.123.072001},
journal = {Physical Review Letters},
number = 7,
volume = 123,
place = {United States},
year = {2019},
month = {8}
}

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