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Quantum Field Theory - Uwe
Quantum Field Theory - Uwe

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Part 2a

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JPD@Muon potential

Elementary particles and the exasperating Higgs boson: the ideas
Elementary particles and the exasperating Higgs boson: the ideas

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...  Hadron spectrum, and elastic and transition form factors provide unique information about long-range interaction between lightquarks and distribution of hadron's characterising properties amongst its QCD constituents.  Dynamical Chiral Symmetry Breaking (DCSB) is most important mass generating me ...
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... • Both observations explained by Cabibbo hypothesis (1963): weak eigenstates are different from mass eigenstates, i.e. weak interactions of quarks have same strength as for leptons but a u-quark couples to a linear combination of s and d ...
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... value B = +1 for baryons and −1 for anti-baryons, and 0 for all other particles. The conservation of baryon number requires the same total baryon number before and after the reaction. Although there are no known violations of baryon conservation, there are theoretical indications that it was violate ...
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An introduction to lattice gauge theory and spin systems

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< 1 2 3 4 5 6 7 8 ... 56 >

Technicolor (physics)

Technicolor theories are models of physics beyond the standard model that address electroweak gauge symmetry breaking, the mechanism through which W and Z bosons acquire masses. Early technicolor theories were modelled on quantum chromodynamics (QCD), the ""color"" theory of the strong nuclear force, which inspired their name.Instead of introducing elementary Higgs bosons to explain observed phenomena, technicolor models hide electroweak symmetry and generate masses for the W and Z bosons through the dynamics of new gauge interactions. Although asymptotically free at very high energies, these interactions must become strong and confining (and hence unobservable) at lower energies that have been experimentally probed. This dynamical approach is natural and avoids issues of Quantum triviality and the hierarchy problem of the Standard Model.In order to produce quark and lepton masses, technicolor has to be ""extended"" by additional gauge interactions. Particularly when modelled on QCD, extended technicolor is challenged by experimental constraints on flavor-changing neutral current and precision electroweak measurements. It is not known what is the extended technicolor dynamics.Much technicolor research focuses on exploring strongly interacting gauge theories other than QCD, in order to evade some of these challenges. A particularly active framework is ""walking"" technicolor, which exhibits nearly conformal behavior caused by an infrared fixed point with strength just above that necessary for spontaneous chiral symmetry breaking. Whether walking can occur and lead to agreement with precision electroweak measurements is being studied through non-perturbative lattice simulations.Experiments at the Large Hadron Collider are expected to discover the mechanism responsible for electroweak symmetry breaking, and will be critical for determining whether the technicolor framework provides the correct description of nature. In 2012 these experiments declared the discovery of a Higgs-like boson with mass approximately 7002125000000000000♠125 GeV/c2; such a particle is not generically predicted by technicolor models, but can be accommodated by them.
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