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

被引：162

作者：

Ali, A. ^{[10
]}

Amaryan, M. ^{[22
]}

Anassontzis, E. G. ^{[2
]}

Austregesilo, A. ^{[3
]}

Baalouch, M. ^{[22
]}

Barbos, F. ^{[14
]}

Barlow, J. ^{[7
]}

Barnes, A. ^{[3
]}

Barriga, E. ^{[7
]}

Beattie, T. D. ^{[23
]}

Berdnikov, V. V. ^{[17
]}

Black, T. ^{[20
]}

Boeglin, W. ^{[6
]}

Boer, M. ^{[4
]}

Briscoe, W. J. ^{[8
]}

Britton, T. ^{[14
]}

Brooks, W. K. ^{[24
]}

Cannon, B. E. ^{[7
]}

Cao, N. ^{[11
]}

Chudakov, E. ^{[14
]}

Cole, S. ^{[1
]}

Cortes, O. ^{[8
]}

Crede, V ^{[7
]}

Dalton, M. M. ^{[14
]}

Daniels, T. ^{[20
]}

Deur, A. ^{[14
]}

Dobbs, S. ^{[7
]}

Dolgolenko, A. ^{[13
]}

Dotel, R. ^{[6
]}

Dugger, M. ^{[1
]}

Dzhygadlo, R. ^{[10
]}

Egiyan, H. ^{[14
]}

Ernst, A. ^{[7
]}

Eugenio, P. ^{[7
]}

Fanelli, C. ^{[16
]}

Fegan, S. ^{[8
]}

Foda, A. M. ^{[23
]}

Foote, J. ^{[12
]}

Frye, J. ^{[12
]}

Furletov, S. ^{[14
]}

Gan, L. ^{[20
]}

Gasparian, A. ^{[19
]}

Gauzshtein, V ^{[25
,26
]}

Gevorgyan, N. ^{[27
]}

Gleason, C. ^{[12
]}

Goetzen, K. ^{[10
]}

Goncalves, A. ^{[7
]}

Goryachev, V. S. ^{[13
]}

Guo, L. ^{[6
]}

Hakobyan, H. ^{[24
]}

机构：

[1] Arizona State Univ, Tempe, AZ 85287 USA

[2] Natl & Kapodistrian Univ Athens, Athens 15771, Greece

[3] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[4] Catholic Univ Amer, Washington, DC 20064 USA

[5] Univ Connecticut, Storrs, CT 06269 USA

[6] Florida Int Univ, Miami, FL 33199 USA

[7] Florida State Univ, Tallahassee, FL 32306 USA

[8] George Washington Univ, Washington, DC 20052 USA

[9] Univ Glasgow, Glasgow G12 8QQ, Lanark, Scotland

[10] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany

[11] Inst High Energy Phys, Beijing 100049, Peoples R China

[12] Indiana Univ, Bloomington, IN 47405 USA

[13] Inst Theoret & Expt Phys, Natl Res Ctr, Kurchatov Inst, Moscow 117259, Russia

[14] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA

[15] Univ Massachusetts, Amherst, MA 01003 USA

[16] MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[17] Natl Res Nucl Univ, Moscow Engn Phys Inst, Moscow 115409, Russia

[18] Notfolk State Univ, Norfolk, VA 23504 USA

[19] North Carolina A&T State Univ, Greensboro, NC 27411 USA

[20] Univ North Carolina Wilmington, Wilmington, NC 28403 USA

[21] Northwestern Univ, Evanston, IL 60208 USA

[22] Old Dominion Univ, Norfolk, VA 23529 USA

[23] Univ Regina, Regina, SK S4S 0A2, Canada

[24] Univ Tecn Federico Santa Maria, Casilla 110-V, Valparaiso, Chile

[25] Tomsk State Univ, Tomsk 634050, Russia

[26] Tomsk Polytech Univ, Tomsk 634050, Russia

[27] Yerevan Phys Inst, AI Alikhanian Natl Sci Lab, Yerevan 0036, Armenia

[28] Coll William & Mary, Williamsburg, VA 23185 USA

[29] Wuhan Univ, Wuhan 430072, Hubei, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 123卷 / 07期

基金：

加拿大自然科学与工程研究理事会; 中国国家自然科学基金; 英国科学技术设施理事会; 美国国家科学基金会; 俄罗斯基础研究基金会;

关键词：

Atomic physics - Germanium compounds;

D O I：

10.1103/PhysRevLett.123.072001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the measurement of the gamma p -> 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 that 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 +/- 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/psi p) and cross sections sigma(gamma p -> P-c(+)) x B(P-c(+) -> J/psi p).

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