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  • JLab Implementing MEDCON 5 Precautions Starting Tuesday, March 17 (msg.6)

     

    Posted on behalf of Lab Director, Stuart Henderson
     

    The growing number of COVID19 cases in our region, particularly James City County, requires more aggressive action to protect our employees, their families, our Users, visitors, and the community. At the recommendation of the Jefferson Lab Pandemic Advisory Team we are implementing MEDCON 5 effective today, Monday, March 16.

  • 2016

  • About CJ

    The CJ (CTEQ-Jefferson Lab) Collaboration studies the quark and gluon structure of the nucleon by performing global QCD fits of parton distribution functions (PDFs). These parametrize a vast array of data including deep-inelastic lepton-nucleon scattering, proton-proton collisions (lepton pair creation, W-boson and jet production), and other reactions, with particular focus on the large-x region.

  • Global QCD analysis of pion parton distributions with threshold resummation

    P.C. Barry1, Chueng-Ryong Ji2, N, Sato1, and W. Melintchouk1
    1     Jefferson Lab, Newport News, Virginia 23606, USA
    2 Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA
    Jefferson Lab Angular Moment (JAM) Collaboration

  • Downloading files

  • PDF databases

    • CJ (CTEQ-Jefferson Lab) unpolarized PDFs
       
    • JR (Jimenez-Delgado--Reya) unpolarized PDFs
       
    • LHAPDF (Les Huches Accord PDF Interface)
       
    • Durham PDF database
       

    Miscellaneous

  • Octopus -- big picture with detailed legs.

    Novel Scientific Aspects (more details than main page)

    • Simultaneous extractions
    • Monte Carlo
    • Bayesian inference
    • Uncertainty quantification
    • Higher theory
      • Beyond leading power
      • Nuclear effects
    • Machine learning

    Generic analysis flowchart

  • The generalized parton distributions in part describe the spatial distributions of bound partons.

  • JAM is a group that influences all parts of JLAB and scientific research. The projects we work on cover a wide range of physics.