Particle Physics Project Prioritization Panel

The Particle Physics Project Prioritization Panel, or P5, is a scientific advisory panel tasked with recommending plans for U.S. investment in particle physics research over a ten-year time frame, on the basis of various funding scenarios. The P5 is a subcommittee of the High Energy Physics Advisory Panel (HEPAP), which serves the Department of Energy's Office of High Energy Physics and the National Science Foundation.

In May 2014, the P5 released its 2014 report, which identified three "high priority large category" projects meriting significant investment: the High Luminosity Large Hadron Collider (a proposed upgrade to the Large Hadron Collider located at CERN in Europe); the International Linear Collider (a proposed electron-positron collider, likely hosted in Japan); and the Long Baseline Neutrino Facility (an expansion of the proposed Long Baseline Neutrino Experiment, to be constructed at Fermilab in Illinois and at the Homestake Mine in South Dakota).