What is pdg?

PDG can refer to several things, most commonly:

• Particle Data Group (PDG): This is the most likely meaning. The Particle Data Group is an international collaboration of physicists who compile and review data on the properties of elementary particles. They produce the renowned "Review of Particle Physics," a comprehensive and regularly updated resource used by physicists worldwide. This review includes information on particle masses, lifetimes, decay modes, and quantum numbers. Their website is a crucial resource for anyone working in particle physics.

• Program Dependence Graph (PDG): In computer science, a Program Dependence Graph is a control-flow graph representation of a program that shows the dependencies between different parts of the code. It's used in compiler optimization, program analysis, and software engineering. It illustrates data dependencies (where the value of one statement affects another) and control dependencies (where the execution of one statement depends on another).

• Other less common meanings: PDG might also be an acronym for other things depending on the context. Without more information, it's impossible to say for sure.

To understand what someone means by "PDG," you need to consider the context. If they're talking about physics, it's almost certainly the Particle Data Group. If they're talking about software engineering or computer science, it's likely the Program Dependence Graph.