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The force keeping quarks together in hadrons is the strong interaction, studied by quantum chromodynamics. It acts on particles, such as quarks, which carry color charge...


zero point field random oscillations permeates all space. They are observed also freezing an ambient a few thousandths of kelvin degree over the absolute zero, implying that their origin is non thermal. Cutting to 1 mm the metallic sensible part of the probe of a common oscilloscope, allows to measure what the animation above tries to show (image credit W. Brown, 2012)


Quantum Chromodynamics (QCD) Quantum Chromodynamics (QCD) Elena Long, a graduate student at Kent State University, provides a simple introduction to a very difficult subject: Quantum Chromodynamics.


Streamer chamber photo of a pion-muon-electron (pi-mu-e) decay chain resulting from an antiproton annihilation. The antiproton enters from the bottom of the picture & annihilates with a proton in neon gas filling the chamber; their energy materialises as 3 nuclear fragments (thick tracks) & several pions (less dense tracks). One positive pion curls tightly to the right in the chamber’s magnetic field before decaying to a muon; the muon forms the spiral at top before decaying to a positron…


Quantum chromodynamics is conceptually simple. Its realization in nature, however, is usually very complex. But not always.


Visualization of Quantum Chromodynamics: four-dimensional structure of gluon-field configurations averaged over in describing the vacuum properties of QCD. Derek Leinweber