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ATLAS experiment at the CERN Large Hadron Collider
ATLAS experiment at the CERN Large Hadron Collider

Unparticle_Dark_Matter_(GUT07)
Unparticle_Dark_Matter_(GUT07)

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Symmetry and Its Violation -unifying concept of universe

... quarks and electromagnetic Quantum leptons (photon: g) Field ...
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PowerPoint

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Physics in Ultracold atoms

... ( x1 , x2 )  ( x2 , x1 ), + for boson and - for fermion Therefore, for fermion we have ( x, x)  0, i.e. fermions like to be far away, but bosons do like to be close ! ...
Large N quantum system
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... Properties fixed by the Schwarzian • Free energy • Part of the four point function that comes from the explicit conformal symmetry breaking. This part leads to a correlators with maximal growth in the commutator. ...
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General formula of effective potential in 5D SU(N) - www
General formula of effective potential in 5D SU(N) - www

... We show a simple method to calculate the 1-loop effective potential of the Wilson line in the Hosotani mechanism. This method does not rely on a matrix representation, but depends on a group theoretical analysis. Thus it is available for more than 5 dimensional theories with any gauge symmetry. As an ...
On-Shell Methods in Quantum Field Theory
On-Shell Methods in Quantum Field Theory

... • Truncated perturbation theory isn’t • Dependence is ~ the first missing order * logs • Similarly for factorization scale — define parton distributions ...
Beyond the Standard Model - Particle Physics Department (PPD)
Beyond the Standard Model - Particle Physics Department (PPD)

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A modern view of forces - HEP Educational Outreach

... The EM force • The quantum description of EM interactions of charged particles is called QED (Quantum ElectroDynamics). Richard Feynman was a pioneer in developing QED. • Thanks to him (and others), we can draw diagrams of interactions, apply well known “Feynman rules” to them, and calculate the ra ...
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Departament de Física Grup de Física Teòrica processes beyond the Standard Model

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The 1/N expansion method in quantum field theory

... a well defined fixed value in each physical problem, N = 2, 3, . . . , etc. It is however tempting to consider the case where N is a free parameter which can be varied at will. In particular, large values of N , with the limit N → ∞, seem to be of interest. At first sight, it might seem that taking ...
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6. Divisibility of atoms: from radioactivity to particle physics

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LHC Physics - UCL HEP Group

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Maxim`s talk

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Spin Excitations in the Spin-Tetrahedral

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Quantum Reality

... “Bosons are gregarious groupies. If one boson is in a particular quantum state, all other bosons are "invited in" to share the same state. The more bosons that pile into the state, the stronger becomes the tendency for others to join them. In such a state, a very large number of particle will have ...
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#NSLive Mysteries of matter: What the LHC will discover next

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ppt - High Energy Physics

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Chapter 15 PowerPoint

People`s Physics Book 3e Ch 22-1 The Big Idea All matter is
People`s Physics Book 3e Ch 22-1 The Big Idea All matter is

< 1 ... 42 43 44 45 46 47 48 49 50 ... 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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