First Measurement of Near-Threshold J/ψ Photoproduction on the Neutron
Abstract
We report the first measurement of the total and t-differential cross sections for near-threshold J/ψ photoproduction on the neutron, obtained with the CLAS12 detector at the Thomas Jefferson National Accelerator Facility. The measurements, performed using a liquid-deuterium target, also provide the incoherent total and t-differential cross sections on the bound proton, enabling the first direct comparison of near-threshold J/ψ photoproduction on bound protons and neutrons. Interpreted within Vector Meson Dominance, holographic QCD, and GPD-based frameworks, the data allow for the investigation of the gluonic structure of bound nucleons. A comparison with free proton results reveals hints of modifications to the gluon structure of nucleons in the nuclear medium, within the assumptions of the extraction and on the underlying production mechanism. The comparison of bound neutron and bound proton cross sections provides new constraints on the near-threshold J/ψ production mechanism, which is crucial in order to establish J/ψ photoproduction as a probe of the nucleon's gluonic structure.
Related
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BibTeX
@misc{tyson2026first,
title = {{First Measurement of Near-Threshold J/ψ Photoproduction on the Neutron}},
author = {R Tyson and D.G Ireland and B Mckinnon and P Chatagnon and V Kubarovsky and S Stepanyan and A.G Acar and P Achenbach and J.S Alvarado and M.J Amaryan and W.R Armstrong and H Avakian and L Barion and M Bashkanov and M Battaglieri and F Benmokhtar and A Bianconi and A.S Biselli and A Biswas and M Bondi and F Bossù and S Boiarinov and K.-Th Brinkmann and W.J Briscoe and W.K Brooks and J Bryce and N.L Bucuru and S Bueltmann and V.D Burkert and T Cao and D.S Carman and A Celentano and H Chinchay and G Ciullo and E.W Cline and P.L Cole and M Contalbrigo and A d'Angelo and N Dashyan and R de Vita and A Deur and S Diehl and C Dilks and C Djalali and R Dupre and H Egiyan and M Ehrhart and A El Alaoui and L El Fassi and L Elouadrhiri and C Fanelli and M Farooq and S Fegan and I.P Fernando and E Ferrand and A Filippi and C Fogler and S Frantzen and K Gates and G.P Gilfoyle},
howpublished = {HAL},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.03579},
eprint = {2609.03579},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05759153v1},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - First Measurement of Near-Threshold J/ψ Photoproduction on the Neutron
AU - R Tyson
AU - D.G Ireland
AU - B Mckinnon
AU - P Chatagnon
AU - V Kubarovsky
AU - S Stepanyan
AU - A.G Acar
AU - P Achenbach
AU - J.S Alvarado
AU - M.J Amaryan
AU - W.R Armstrong
AU - H Avakian
AU - L Barion
AU - M Bashkanov
AU - M Battaglieri
AU - F Benmokhtar
AU - A Bianconi
AU - A.S Biselli
AU - A Biswas
AU - M Bondi
AU - F Bossù
AU - S Boiarinov
AU - K.-Th Brinkmann
AU - W.J Briscoe
AU - W.K Brooks
AU - J Bryce
AU - N.L Bucuru
AU - S Bueltmann
AU - V.D Burkert
AU - T Cao
AU - D.S Carman
AU - A Celentano
AU - H Chinchay
AU - G Ciullo
AU - E.W Cline
AU - P.L Cole
AU - M Contalbrigo
AU - A d'Angelo
AU - N Dashyan
AU - R de Vita
AU - A Deur
AU - S Diehl
AU - C Dilks
AU - C Djalali
AU - R Dupre
AU - H Egiyan
AU - M Ehrhart
AU - A El Alaoui
AU - L El Fassi
AU - L Elouadrhiri
AU - C Fanelli
AU - M Farooq
AU - S Fegan
AU - I.P Fernando
AU - E Ferrand
AU - A Filippi
AU - C Fogler
AU - S Frantzen
AU - K Gates
AU - G.P Gilfoyle
PY - 2026
DA - 2026/09/14
PB - HAL
DO - 10.48550/arxiv.2609.03579
UR - https://hal.science/hal-05759153v1
AB - We report the first measurement of the total and t-differential cross sections for near-threshold J/ψ photoproduction on the neutron, obtained with the CLAS12 detector at the Thomas Jefferson National Accelerator Facility. The measurements, performed using a liquid-deuterium target, also provide the incoherent total and t-differential cross sections on the bound proton, enabling the first direct comparison of near-threshold J/ψ photoproduction on bound protons and neutrons. Interpreted within Vector Meson Dominance, holographic QCD, and GPD-based frameworks, the data allow for the investigation of the gluonic structure of bound nucleons. A comparison with free proton results reveals hints of modifications to the gluon structure of nucleons in the nuclear medium, within the assumptions of the extraction and on the underlying production mechanism. The comparison of bound neutron and bound proton cross sections provides new constraints on the near-threshold J/ψ production mechanism, which is crucial in order to establish J/ψ photoproduction as a probe of the nucleon's gluonic structure.
ER -