Lucas Ehinger

Lucas Ehinger

Experimental Nuclear Physics PhD Student at MIT

First Measurement of Sub-Threshold J/Psi Photo-Production

While the EMC effect is well established for quarks, nucleon modification has not been extensively studied for gluons.

Using the real photon beam at Jefferson Lab’s Hall D, we performed the first ever measurement of sub-threshold J/Psi photo-production, providing insights into nuclear gluon structure and laying the groundwork for future high statistics measurements.

Photos

JPsi photos

Relevant publications and Talks

Publications

  • Threshold J/ψ Photoproduction as a Probe of Nuclear Gluon Structure
    J. R. Pybus, D. Dutta, H. Gao, O. Hen, et al.
    | arXiv
    Appoved beamtime proposal at Jefferson Lab
  • First Measurement of Near-Threshold and Subthreshold 𝐽/𝜓 Photoproduction off Nuclei
    J. R. Pybus, L. Ehinger, T. Kolar, B. Devkota, P. Sharp, B. Yu, M. M. Dalton, D. Dutta, H. Gao, O. Hen et al.
    Physical Review Letters (2025) | arXiv
    Published as editor's suggestion
  • Strong Interaction Physics at the Luminosity Frontier with 22 GeV Electrons at Jefferson Lab
    A. Accardi, P. Achenbach, D. Adhikari, et al.
    | arXiv

    • Talks

  • First Measurement of Near- and Sub-Threshold J/ψ Photoproduction off Nuclei
    Photonuclear reactions workshop (2024), Boston, MA, USA