Particle Physics Project Prioritization Panel
The Particle Physics Project Prioritization Panel (P5) is a scientific advisory panel tasked with recommending plans for U.S. investment in particle physics research over the next ten years, on the basis of various funding scenarios. The P5 is a temporary subcommittee of the High Energy Physics Advisory Panel (HEPAP), which serves the Department of Energy's Office of Science and the National Science Foundation. , the panel was chaired by Steven Ritz of the University of California, Santa Cruz. The next P5 panel is scheduled to be convened in September, 2022. 2014 Report. In 2013, HEPAP  was asked to convene a panel (the P5) to evaluate research priorities in the context of anticipated developments in the field globally in the next 20 years. Recommendations were to be made on the basis of three funding scenarios for high-energy physics: Science Drivers. In May 2014, the first P5 report since 2008 was released. The 2014 report identified five "science drivers"—goals intended to inform funding priorities—drawn from a year-long discussion within the particle physics community. These science drivers are: Recommendations. In pursuit of the five science drivers, the 2014 report identified three "high priority large category  projects meriting significant investment in the FY2014–2023 period, regardless of the broader funding situation: 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 (that was renamed the Deep Underground Neutrino Experiment), to be constructed at Fermilab in Illinois and at the Homestake Mine in South Dakota). In addition to these large projects, the report identified numerous smaller projects with potential for near	Particle Physics Project Prioritization Panel
27383934	-term return on investment, including the Mu2e experiment, second- and third-generation dark matter experiments, particle-physics components of the Large Synoptic Survey Telescope (LSST), cosmic microwave background experiments, and a number of small neutrino experiments. The report made several recommendations for significant shifts in priority, namely: The panel stressed that the most conservative of the funding scenarios considered would endanger the ability of the U.S. to host a major particle physics project while maintaining the necessary supporting elements. Impact and Outcomes Since 2014. A goal of the 2014 P5 exercise was to provide Congress with a science-justified roadmap 	Particle Physics Project Prioritization Panel
27383935	for project funding. Five years later, in 2019, the Department of Energy Office of Science declared: Congressional appropriations reflect strong support for P5. Language in appropriations reports have consistently recognized community’s efforts in creating and executing the P5 report strategy" and "P5 was wildly successful." From 2016 to 2020, the High Energy Physics (HEP) budget grew from less than $800 million to more than $1 billion. However, members of the HEP community were concerned because the increased funding went primarily toward projects, while funding for core research and technology programs, which was also supported by P5, declined  from $361 million to $316 million. In 2020, an assessment of progress of the P5-defined program produced by the High Energy Physics Advisory Panel (HEPAP) concluded: "While investments over the past 5 years have focused on project construction, it will be fundamentally important to balance the components of the HEP budget to continue successful execution of the P5 plan. Operations of the newly constructed experiments require full support to reap their scientific goals. The HEP research program also needs strong support to fully execute the plan, throughout the construction, operations, and data analysis phases of the experiments , and to lay a foundation for the future." As of 2022, several of the "Large Projects" identified as priorities by the 2014 P5 had fallen considerably behind schedule or been affected by cost gaps, including: 2023 Report. The next P5 panel will be convened in September, 2022., and will report in 2023. As was the case for the 2014 report, input to P5 comes from the Snowmass Process. This community study was held in 2020-2022.