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shp_09 - Nevis Laboratories
shp_09 - Nevis Laboratories

... the few tests of GUT physics that would be manifest at everyday energies. Computations show that relative to most elementary particles, the proton is very stable; its lifetime according to the SU(5) GUT is 1030 years! How can we detect such an effect? Put many protons together –e.g., in a huge tank ...
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Slides - Indico

... But, if gravity becomes strong around the TeV scale, why is the large distance gravity so much weaker than all the other forces of nature? For example, gravitational attraction between the two protons at 1 m distance is 1037 times weaker of their Coulomb repulsion! ...
Slides - Indico
Slides - Indico

... • The gravitino is not a WIMP, but it is a viable dark matter candidate. • The gravitino is the supersymmetric partner of the graviton. If it exists, it is a fermion of spin 3⁄2 and therefore obeys the Rarita-Schwinger equation. • If supersymmetry is to solve the hierarchy problem of the Standard Mo ...
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... singularities, approximations, mathematical tricks such as the mathematical indeterminate forms and others, and free parameters. Moreover, within SST we can partially unify GR and QP/SM and show that unification of these theories within the same methods is impossible – it does not follow from incomp ...
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Experimental Tests of the Standard Model
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... Problems of the Standard Model A subjective selection of three open areas in particle physics about which the Standard Model has nothing to say. (i) Cosmology: Dark matter. 22% of universe's energy budget in the form of "dark matter". Current evidence suggests that WIMPs: electrically neutral and w ...
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... those that interact weakly have a small mass, and those that don't interact have no mass and move at lightspeed. If the Higgs had turned out (as was possible) not to exist, fundamental physics would have been turned into a messy can of worms. This would have been interesting, but embarrassing for ph ...
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... _________. He also believed that matter could not be ______________, _______________, or further ________________. His theory was met with criticism from other influential philosophers such as __________________. His theory was eventually rejected because it was not supported by ________________ ___ ...
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High Energy Physics - Homer L. Dodge Department of Physics and
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... Tevatron with the world's highest energy proton antiproton collisions, which can be used to study the strong (QCD) and electroweak interactions through the decays of the produced particles and through their measured angular distributions. Some of the recent results from the DØ experiment include the ...
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... The quadratic divergences of H mass diagrams with W, Z are naturally cancelled by contributions from new W, Z bosons with mass of 1-2 TeV. If this model is correct, these bosons ought to appear soon in searches at the LHC. ...
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Anticipating New Physics at the LHC

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Supersymmetry

Supersymmetry (SUSY), a theory of particle physics, is a proposed type of spacetime symmetry that relates two basic classes of elementary particles: bosons, which have an integer-valued spin, and fermions, which have a half-integer spin. Each particle from one group is associated with a particle from the other, known as its superpartner, the spin of which differs by a half-integer. In a theory with perfectly ""unbroken"" supersymmetry, each pair of superpartners would share the same mass and internal quantum numbers besides spin. For example, there would be a ""selectron"" (superpartner electron), a bosonic version of the electron with the same mass as the electron, that would be easy to find in a laboratory. Thus, since no superpartners have been observed, if supersymmetry exists it must be a spontaneously broken symmetry so that superpartners may differ in mass. Spontaneously-broken supersymmetry could solve many mysterious problems in particle physics including the hierarchy problem. The simplest realization of spontaneously-broken supersymmetry, the so-called Minimal Supersymmetric Standard Model, is one of the best studied candidates for physics beyond the Standard Model.There is only indirect evidence and motivation for the existence of supersymmetry. Direct confirmation would entail production of superpartners in collider experiments, such as the Large Hadron Collider (LHC). The first run of the LHC found no evidence for supersymmetry (all results were consistent with the Standard Model), and thus set limits on superpartner masses in supersymmetric theories. Whilst many remain enthusiastic about supersymmetry, this first run at the LHC led some physicists to explore other ideas. In any case, in 2015 the LHC resumed its search for supersymmetry and other new physics in its second run.
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