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arxiv: 2409.18463 · v2 · pith:PKIROBZJ · submitted 2024-09-27 · nucl-ex

First Measurement of Near- and Sub-Threshold J/psi Photoproduction off Nuclei

J.R. Pybus , L. Ehinger , T. Kolar , B. Devkota , P. Sharp , B. Yu , M.M. Dalton , D. Dutta
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H. Gao O. Hen E. Piasetzky S.N. Santiesteban A. Schmidt A. Somov H. Szumila-Vance S. Adhikari A. Asaturyan A. Austregesilo C. Ayerbe Gayoso J. Barlow V.V. Berdnikov H.D. Bhatt Deepak Bhetuwal T. Black W.J. Briscoe G. Chung P.L. Cole A. Deur R. Dotel H. Egiyan P. Eugenio C. Fanelli L. Gan A. Gasparian J. Guo K. Hernandez D.W. Higinbotham P. Hurck I. Jaegle R.T. Jones V. Kakoyan A. Karki H. Li W.B. Li G.R. Linera V. Lyubovitskij H. Marukyan M.D. McCaughan M. McCracken K. Mizutani D. Nguyen S. Oresic A.I. Ostrovidov Z. Papandreou C. Paudel K. Peters J. Ritman A. Schick J. Schwiening A. Smith S. Somov I. Strakovsky K. Suresh V.V. Tarasov S. Taylor T. Xiao Z. Zhang X. Zhou
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We report on the first measurement of $J/\psi$ photoproduction from nuclei in the photon energy range of $7$ to $10.8$ GeV, extending above and below the photoproduction threshold in the free proton of $\sim8.2$ GeV. The experiment used a tagged photon beam incident on deuterium, helium, and carbon, and the GlueX detector at Jefferson Lab to measure the semi-inclusive $A(\gamma,e^+e^-p)$ reaction with a dilepton invariant mass $M(e^+e^-)\sim m_{J/\psi}=3.1$ GeV. The incoherent $J/\psi$ photoproduction cross sections in the measured nuclei are extracted as a function of the incident photon energy, momentum transfer, and proton reconstructed missing light-cone momentum fraction. Comparisons with theoretical predictions assuming a dipole form factor allow extracting a gluonic radius for bound protons of $\sqrt{\langle r^2\rangle}=0.85\pm0.14$ fm. The data also suggest an excess of the measured cross section for sub-threshold production and for interactions with high missing light-cone momentum fraction protons. The measured enhancement can be explained by modified gluon structure for high-virtuality bound-protons.

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