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presentation source
presentation source

... The W and Z are extremely short-lived, but can be identified by their decay modes, also predicted by electroweak theory ene ...
Particle Zoo - University of Birmingham
Particle Zoo - University of Birmingham

... freedom which allowed formulation of Pauli exclusion principle. In 1925, it was suggested that it relates to self-rotation, but heavily criticised… only useful as a picture. In 1927 Pauli formulated theory of spin as a fully quantum object (non-relativistic). In 1928 Dirac described the relativistic ...
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... supernova lying 8 billion lightyears away. We compare this proton with one freshly minted in a particle accelerator here on Earth. And the two are exactly the same! How is this possible? Why aren’t there errors in proton production? How can two objects, manufactured so far apart in space and time, b ...
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Identical particles

Identical particles, also called indistinguishable or indiscernible particles, are particles that cannot be distinguished from one another, even in principle. Species of identical particles include, but are not limited to elementary particles such as electrons, composite subatomic particles such as atomic nuclei, as well as atoms and molecules. Quasiparticles also behave in this way. Although all known indistinguishable particles are ""tiny"", there is no exhaustive list of all possible sorts of particles nor a clear-cut limit of applicability; see particle statistics #Quantum statistics for detailed explication.There are two main categories of identical particles: bosons, which can share quantum states, and fermions, which do not share quantum states due to the Pauli exclusion principle. Examples of bosons are photons, gluons, phonons, helium-4 nuclei and all mesons. Examples of fermions are electrons, neutrinos, quarks, protons, neutrons, and helium-3 nuclei.The fact that particles can be identical has important consequences in statistical mechanics. Calculations in statistical mechanics rely on probabilistic arguments, which are sensitive to whether or not the objects being studied are identical. As a result, identical particles exhibit markedly different statistical behavior from distinguishable particles. For example, the indistinguishability of particles has been proposed as a solution to Gibbs' mixing paradox.
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