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

GlueX Collaboration; H. Hakobyan; A. Hamdi; S. Han; J. Hardin; G. M.  Huber; A. Hurley,; D. G.  Ireland,; M. M.  Ito; N. S.  Jarvis; R. T.  Jones; V. Kakoyan; G.  Kalicy; M Kamel; C. Kourkoumelis; S.  Kuleshov; I Kuznetsov; I.  Larin,; D Lawrence; D. I.  Lersch; H. Li; W.  Li; B. Liu; K. Livingston; G. J. Lolos; V. Lyubovitskij; D. Mack; H.  Marukyan; V. Matveev; M. McCaughan; M. E. McCracken; W. McGinley; Jo McIntyre; C. A. Meyer; R. Miskimen; R. E.  Mitchell; F. Mokaya; F. Nerling; L. Ng; A. I. Ostrovidov; Z. Papandreou; M. Patsyuk; P. Pauli; R. Pedroni; L. Pentchev; K. J. Peters; W. Phelps; E. Pooser; N.  Qin; J. Reinhold; B G Ritchie; L.  Robison; D. Romanov; C. Romero; C. Salgado; A. M.  Schertz; R. A. Schumacher; J.  Schwiening; K. K. Seth; X. Shen; M. R. Shepherd; E. S. Smith; D. I. Sober; A. Somov; S. Somov; O. Soto; J. R. Stevens; I. I. Strakovsky; K. Suresh; V. Tarasov; S. Taylor; A. Teymurazyan; A. Thiel; G. Vasileiadis; T. Whitlatch; N. Wickramaarachchi; M. Williams; T. Xiao; Y. Yang; J. Zarling; Z. Zhang; G. Zhao; Q  Zhou; X. Zhou; B. Zihlmann

doi:10.1103/PhysRevLett.123.072001

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

GlueX Collaboration, H. Hakobyan, A. Hamdi, S. Han, J. Hardin, G. M. Huber, A. Hurley,, D. G. Ireland,, M. M. Ito, N. S. Jarvis, R. T. Jones, V. Kakoyan, G. Kalicy, M Kamel, C. Kourkoumelis, S. Kuleshov, I Kuznetsov, I. Larin,, D Lawrence, D. I. LerschH. Li, W. Li, B. Liu, K. Livingston, G. J. Lolos, V. Lyubovitskij, D. Mack, H. Marukyan, V. Matveev, M. McCaughan, M. E. McCracken, W. McGinley, Jo McIntyre, C. A. Meyer, R. Miskimen, R. E. Mitchell, F. Mokaya, F. Nerling, L. Ng, A. I. Ostrovidov, Z. Papandreou, M. Patsyuk, P. Pauli, R. Pedroni, L. Pentchev^*, K. J. Peters, W. Phelps, E. Pooser, N. Qin, J. Reinhold, B G Ritchie, L. Robison, D. Romanov, C. Romero, C. Salgado, A. M. Schertz, R. A. Schumacher, J. Schwiening, K. K. Seth, X. Shen, M. R. Shepherd, E. S. Smith, D. I. Sober, A. Somov, S. Somov, O. Soto, J. R. Stevens, I. I. Strakovsky, K. Suresh, V. Tarasov, S. Taylor, A. Teymurazyan, A. Thiel, G. Vasileiadis, T. Whitlatch, N. Wickramaarachchi, M. Williams, T. Xiao, Y. Yang, J. Zarling, Z. Zhang, G. Zhao, Q Zhou, X. Zhou, B. Zihlmann

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

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 language	English
Article number	072001
Journal	Physical Review Letters
Volume	123
Issue number	7
Early online date	13 Aug 2019
DOIs	https://doi.org/10.1103/PhysRevLett.123.072001
Publication status	Published - 16 Aug 2019

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10.1103/PhysRevLett.123.072001

PhysRevLett.123.072001
© 2019 American Physical Society
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https://arxiv.org/pdf/1905.10811.pdf

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GlueX Collaboration, 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., ... Zihlmann, B. (2019). First Measurement of Near-Threshold J /ψ Exclusive Photoproduction off the Proton. Physical Review Letters, 123(7), Article 072001. https://doi.org/10.1103/PhysRevLett.123.072001

@article{fac856ed7bef4a6db4ef4406ec0c707f,

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).",

author = "{GlueX Collaboration} and A. Ali and M. Amaryan and Anassontzis, {E. G.} and A. Austregesilo and M. Baalouch and F. Barbosa and J. Barlow and A. Barnes and E. Barriga and Beattie, {T. D.} and Berdnikov, {V. V.} and T. Black and W. Boeglin and M. Boer and Briscoe, {W. J.} and T. Britton and Brooks, {W. K.} and Cannon, {B. E.} and N. Cao and E. Chudakov and S. Cole and O. Cortes and V. Crede and Dalton, {M. M.} and T. Daniels and A. Deur and S. Dobbs and A. Dolgolenko and R. Dotel and M. Dugger and R. Dzhygadlo and H. Egiyan and A. Ernst and P. Eugenio and C. Fanelli and S. Fegan and Foda, {A. M.} and J. Foote and J. Frye and S. Furletov and L. Gan and A. Gasparian and V. Gauzshtein and N. Gevorgyan and C. Gleason and K. Goetzen and A. Goncalves and Goryachev, {V. S.} and L. Guo and H. Hakobyan and A. Hamdi and S. Han and J. Hardin and Huber, {G. M.} and A. Hurley, and Ireland,, {D. G.} and Ito, {M. M.} and Jarvis, {N. S.} and Jones, {R. T.} and V. Kakoyan and G. Kalicy and M Kamel and C. Kourkoumelis and S. Kuleshov and I Kuznetsov and I. Larin, and D Lawrence and Lersch, {D. I.} and H. Li and W. Li and B. Liu and K. Livingston and Lolos, {G. J.} and V. Lyubovitskij and D. Mack and H. Marukyan and V. Matveev and M. McCaughan and McCracken, {M. E.} and W. McGinley and Jo McIntyre and Meyer, {C. A.} and R. Miskimen and Mitchell, {R. E.} and F. Mokaya and F. Nerling and L. Ng and Ostrovidov, {A. I.} and Z. Papandreou and M. Patsyuk and P. Pauli and R. Pedroni and L. Pentchev and Peters, {K. J.} and W. Phelps and E. Pooser and N. Qin and J. Reinhold and Ritchie, {B G} and L. Robison and D. Romanov and C. Romero and C. Salgado and Schertz, {A. M.} and Schumacher, {R. A.} and J. Schwiening and Seth, {K. K.} and X. Shen and Shepherd, {M. R.} and Smith, {E. S.} and Sober, {D. I.} and A. Somov and S. Somov and O. Soto and Stevens, {J. R.} and Strakovsky, {I. I.} and K. Suresh and V. Tarasov and S. Taylor and A. Teymurazyan and A. Thiel and G. Vasileiadis and D. Werthm{\"u}ller and T. Whitlatch and N. Wickramaarachchi and M. Williams and T. Xiao and Y. Yang and J. Zarling and Z. Zhang and G. Zhao and Q Zhou and X. Zhou and B. Zihlmann",

note = " {\textcopyright} 2019 American Physical Society",

year = "2019",

month = aug,

day = "16",

doi = "10.1103/PhysRevLett.123.072001",

language = "English",

volume = "123",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "7",

}

GlueX Collaboration, Hakobyan, H, Hamdi, A, Han, S, Hardin, J, Huber, GM, Hurley, A, Ireland, DG, Ito, MM, Jarvis, NS, Jones, RT, Kakoyan, V, Kalicy, G, Kamel, M, Kourkoumelis, C, Kuleshov, S, Kuznetsov, I, Larin, I, Lawrence, D, Lersch, DI, Li, H, Li, W, Liu, B, Livingston, K, Lolos, GJ, Lyubovitskij, V, Mack, D, Marukyan, H, Matveev, V, McCaughan, M, McCracken, ME, McGinley, W, McIntyre, J, Meyer, CA, Miskimen, R, Mitchell, RE, Mokaya, F, Nerling, F, Ng, L, Ostrovidov, AI, Papandreou, Z, Patsyuk, M, Pauli, P, Pedroni, R, Pentchev, L, Peters, KJ, Phelps, W, Pooser, E, Qin, N, Reinhold, J, Ritchie, BG, Robison, L, Romanov, D, Romero, C, Salgado, C, Schertz, AM, Schumacher, RA, Schwiening, J, Seth, KK, Shen, X, Shepherd, MR, Smith, ES, Sober, DI, Somov, A, Somov, S, Soto, O, Stevens, JR, Strakovsky, II, Suresh, K, Tarasov, V, Taylor, S, Teymurazyan, A, Thiel, A, Vasileiadis, G, Whitlatch, T, Wickramaarachchi, N, Williams, M, Xiao, T, Yang, Y, Zarling, J, Zhang, Z, Zhao, G, Zhou, Q, Zhou, X & Zihlmann, B 2019, 'First Measurement of Near-Threshold J /ψ Exclusive Photoproduction off the Proton', Physical Review Letters, vol. 123, no. 7, 072001. https://doi.org/10.1103/PhysRevLett.123.072001

TY - JOUR

T1 - First Measurement of Near-Threshold J /ψ Exclusive Photoproduction off the Proton

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.

AU - Furletov, S.

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 - Hakobyan, H.

AU - Hamdi, A.

AU - Han, S.

AU - Hardin, J.

AU - Huber, G. M.

AU - Hurley,, A.

AU - Ireland,, D. G.

AU - Ito, M. M.

AU - Jarvis, N. S.

AU - Jones, R. T.

AU - Kakoyan, V.

AU - Kalicy, G.

AU - Kamel, M

AU - Kourkoumelis, C.

AU - Kuleshov, S.

AU - Kuznetsov, I

AU - Larin,, I.

AU - Lawrence, D

AU - Lersch, D. I.

AU - Li, H.

AU - Li, W.

AU - Liu, B.

AU - Livingston, K.

AU - Lolos, G. J.

AU - Lyubovitskij, V.

AU - Mack, D.

AU - Marukyan, H.

AU - Matveev, V.

AU - McCaughan, M.

AU - McCracken, M. E.

AU - McGinley, W.

AU - McIntyre, Jo

AU - Meyer, C. A.

AU - Miskimen, R.

AU - Mitchell, R. E.

AU - Mokaya, F.

AU - Nerling, F.

AU - Ng, L.

AU - Ostrovidov, A. I.

AU - Papandreou, Z.

AU - Patsyuk, M.

AU - Pauli, P.

AU - Pedroni, R.

AU - Pentchev, L.

AU - Peters, K. J.

AU - Phelps, W.

AU - Pooser, E.

AU - Qin, N.

AU - Reinhold, J.

AU - Ritchie, B G

AU - Robison, L.

AU - Romanov, D.

AU - Romero, C.

AU - Salgado, C.

AU - Schertz, A. M.

AU - Schumacher, R. A.

AU - Schwiening, J.

AU - Seth, K. K.

AU - Shen, X.

AU - Shepherd, M. R.

AU - Smith, E. S.

AU - Sober, D. I.

AU - Somov, A.

AU - Somov, S.

AU - Soto, O.

AU - Stevens, J. R.

AU - Strakovsky, I. I.

AU - Suresh, K.

AU - Tarasov, V.

AU - Taylor, S.

AU - Teymurazyan, A.

AU - Thiel, A.

AU - Vasileiadis, G.

AU - Werthmüller, D.

AU - Whitlatch, T.

AU - Wickramaarachchi, N.

AU - Williams, M.

AU - Xiao, T.

AU - Yang, Y.

AU - Zarling, J.

AU - Zhang, Z.

AU - Zhao, G.

AU - Zhou, Q

AU - Zhou, X.

AU - Zihlmann, B.

PY - 2019/8/16

Y1 - 2019/8/16

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).

UR - http://www.scopus.com/inward/record.url?scp=85070894537&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.123.072001

DO - 10.1103/PhysRevLett.123.072001

M3 - Article

AN - SCOPUS:85070894537

SN - 0031-9007

VL - 123

JO - Physical Review Letters

JF - Physical Review Letters

IS - 7

M1 - 072001

ER -

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

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