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Particle Data Group. The Particle Data Group ( 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 ...
Program dependence graph. In computer science, a Program Dependence Graph ( PDG) is a representation of a program's control and data dependencies. It's a directed graph where nodes represent program statements, and edges represent dependencies between these statements. PDGs are useful in various program analysis tasks, including optimizations ...
In mathematics, specifically group theory, the index of a subgroup H in a group G is the number of left cosets of H in G, or equivalently, the number of right cosets of H in G . The index is denoted or or . Because G is the disjoint union of the left cosets and because each left coset has the same size as H, the index is related to the orders ...
A payment terminal, also known as a point of sale (POS) terminal, credit card machine, card reader, PIN pad, EFTPOS terminal (or by the older term as PDQ terminal which stands for "Process Data Quickly" [1] ), is a device which interfaces with payment cards to make electronic funds transfers. The terminal typically consists of a secure keypad ...
The PDG has the power to bind the company vis-à-vis third parties in the interest of the company and within the limit of the company's charter. According to a study by the firm Proxinvest, published in 2018, 57.5% of CAC 40 companies are headed by a PDG, against only 10% of companies in the STOXX Europe 600 index. It is therefore a uniquely ...
The standard model is a quantum field theory, meaning its fundamental objects are quantum fields which are defined at all points in spacetime. QFT treats particles as excited states (also called quanta) of their underlying quantum fields, which are more fundamental than the particles. These fields are.
The Wigner D-matrix is a unitary matrix in an irreducible representation of the groups SU (2) and SO (3). It was introduced in 1927 by Eugene Wigner, and plays a fundamental role in the quantum mechanical theory of angular momentum. The complex conjugate of the D-matrix is an eigenfunction of the Hamiltonian of spherical and symmetric rigid rotors.
Parton (particle physics) In particle physics, the parton model is a model of hadrons, such as protons and neutrons, proposed by Richard Feynman. It is useful for interpreting the cascades of radiation (a parton shower) produced from quantum chromodynamics (QCD) processes and interactions in high-energy particle collisions.