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Experiment sees the arrow of time Experiment sees the arrow of time
Experiment sees the arrow of time Experiment sees the arrow of time

PARTICLE PHYSICS BEYOND THE STANDARD MODEL
PARTICLE PHYSICS BEYOND THE STANDARD MODEL

... imply that we can extrapolate our experimental and theoretical understanding from the electroweak scale to higher energy scales, for example the huge Grand Unification scale where the three gauge couplings essentially unify. In addition, the exact value of the Higgs mass suggests that such an extrap ...
Effective Field Theory Lectures
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... theories of particle physics at low energy without having to know everything about physics at short distances. For example, we can discuss precision radiative corrections in the weak interactions without having a grand unified theory or a quantum theory of gravity. The price we pay is that we have a ...
Gauge Field Theory - High Energy Physics Group
Gauge Field Theory - High Energy Physics Group

Gauge Field Theory - High Energy Physics Group
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Teaching the Standard Model in IB Physics by Debra Blake
Teaching the Standard Model in IB Physics by Debra Blake

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Duality Theory of Weak Interaction

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... work on an n-fold cover of • Obtained by introducing a branch cut at a particular instant of ``time’’ along the spatial region of interest • And identifying values of fields at bottom of branch cut in one copy with their values above the cut in the next. ...
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Jan 27, 2000 Lessons learnt from the heavy tau lepton Fig. 1 Fig. 2
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Models and Stories in Hadron Physics - Philsci

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Quantum Gravity: The View From Particle Physics
Quantum Gravity: The View From Particle Physics

... supergravity may likewise be viewed as variants of the Kaluza-Klein program: they generalize ordinary geometry by including fermionic dimensions. This leads to the replacement of ordinary space-time by a superspace consisting of bosonic (even) and fermionic (odd) coordinates, thus incorporating ferm ...
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The Evolution of Quantum Field Theory, From QED to Grand
The Evolution of Quantum Field Theory, From QED to Grand

... Gell-Mann thought of three fundamental quarks, but Zweig, as he would explain later, assumed that there should be four, thus anticipating the idea of charm. There are four aces in a deck of cards ...
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Activity 151-8 Mole Conversions

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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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