Particle Data Group
The Particle Data Group (or PDG) is an international collaboration of particle physicists that compiles and reanalyzes published results related to the properties of particles and fundamental interactions. It also publishes reviews of theoretical results that are phenomenologically relevant, including those in related fields such as cosmology. The PDG currently publishes the "Review of Particle Physics" and its pocket version, the "Particle Physics Booklet", which are printed biennially as books, and updated annually via the World Wide Web. In previous years, the PDG has published the "Pocket Diary for Physicists", a calendar with the dates of key  international conferences and contact information of major high energy physics institutions, which is now discontinued. PDG also further maintains the standard numbering scheme for particles in event generators, in association with the event generator authors. Section::::"Review of Particle Physics". The "Review of Particle Physics" (formerly "Review of Particle Properties", "Data on Particles and Resonant States", and "Data on Elementary Particles and Resonant States") is a voluminous, 1,200+ page reference work which summarizes particle properties and reviews the current status of elementary particle physics, general relativity and big-bang cosmology. Usually singled out for citation analysis, it is currently the  most cited article in high energy physics, being cited more than 2,000 times annually in the scientific literature (). The Review is currently divided into 3 sections: A condensed version of the "Review", with the "Summary Tables", a significantly shortened "Reviews, Tables and Plots", and without the "Particle Listings", is available as a 300-page, pocket-sized "Particle Physics Booklet". The history of "Review of Particle Physics" can be traced back to the 1957 article "Hyperons and Heavy Mesons (Systematics and Decay)" by Murray Gell-Mann and Arthur H. Rosenfeld, and the unpublished update tables for its data with the title  Data for Elementary Particle Physics (University of California Radiation Laboratory "Technical Report UCRL-8030") that were circulated before the actual publication of the original article. In 1963, Matts Roos independently published a compilation "Data on Elementary Particles and Resonant States". On his suggestion, the two publications were merged a year later into the 1964 "Data on Elementary Particles and Resonant States". The publication underwent three renamings thereafter: 1965 into "Data on Particles and Resonant States", 1970 into "Review of Particle Properties", and 1996 into the present form "Review of Particle Physics". Starting with 1972, the "Review" no longer appear exclusively in  Reviews of Modern Physics, but also in "Physics Letters B", "European Physical Journal C", "Journal of Physics G", "Physical Review D", and "Chinese Physics C" (depending on the year).