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In theoretical physics, quantum chromodynamics (QCD) is the study of the strong interaction between quarks mediated by gluons. Quarks are fundamental particles that make up composite hadrons such as the proton, neutron and pion. QCD is a type of quantum field theory called a non-abelian gauge theory, with symmetry group SU(3).
Shifman is known for a number of basic contributions to quantum chromodynamics, the theory of strong interactions, and to understanding of supersymmetric gauge dynamics.. The most important results due to M. Shifman are diverse and include (i) the discovery of the penguin mechanism in the flavor-changing weak decays (1974); [1] (ii) introduction of the gluon condensate and development of the ...
The key difference between quantum electrodynamics and quantum chromodynamics is that the gluon field strength has extra terms which lead to self-interactions between the gluons and asymptotic freedom. This is a complication of the strong force making it inherently non-linear, contrary to the linear theory of the electromagnetic force.
Quark matter or QCD matter (quantum chromodynamic) refers to any of a number of hypothetical phases of matter whose degrees of freedom include quarks and gluons, of which the prominent example is quark-gluon plasma. [1] Several series of conferences in 2019, 2020, and 2021 were devoted to this topic. [2] [3] [4]
The observations leading to the discovery of this part of the Standard Model are discussed in the article in quantum chromodynamics. The notation W μ ν a {\displaystyle W_{\mu \nu }^{a}} will be used for the gauge field tensor of SU(2) where a runs over the 3 generators of this group.
In the 1970s he was a co-inventor of quantum chromodynamics (QCD) which explains the confinement of quarks in mesons and baryons and forms a large part of the Standard Model of elementary particles and forces. Murray Gell-Mann received the 1969 Nobel Prize in Physics for his work on the theory of elementary particles.
Perturbative quantum chromodynamics (also perturbative QCD) is a subfield of particle physics in which the theory of strong interactions, Quantum Chromodynamics (QCD), is studied by using the fact that the strong coupling constant is small in high energy or short distance interactions, thus allowing perturbation theory techniques to be applied.
Quantum chromodynamics is the study of the SU(3) Yang–Mills theory of color-charged fermions (the quarks) and gluons. Subcategories This category has the following 5 subcategories, out of 5 total.