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The Hierarchy Problem and New Dimensions at a Millimeter
The Hierarchy Problem and New Dimensions at a Millimeter

Laura Covi Institute for Theoretical Physics Georg-August
Laura Covi Institute for Theoretical Physics Georg-August

... They are usually not a thermal relic since if they are thermal their number density is compatible only with Hot/Warm DM... Moreover they do not need to have an exactly conserved quantum number to be ...
Latest Lattice Results for Baryon Spectroscopy
Latest Lattice Results for Baryon Spectroscopy

Chapter 44
Chapter 44

... Explanation of why the expansion of the universe is accelerating? Is there a kind of antigravity force acting between widely separated galaxies? Is it possible to unify electroweak and strong forces? Why do quark and leptons form similar but ...
Observation of the Higgs Boson - Purdue Physics
Observation of the Higgs Boson - Purdue Physics

... with which gives the same effect as mass: – A massless particle travels at the speed of light – Massless particles that “stick” to the Higgs field are slowed down – Photons and gluons don’t couple to the Higgs field so they remain massless. ...
Elementary Particles: A Brief History
Elementary Particles: A Brief History

... particles made of up and down quarks). Quarks and leptons are the particles that make up the matter. Four particles are called gauge bosons. These are the particles that transmit forces and thus allow fermions to interact. The Higgs boson, though not a gauge boson, is required not to transmit force ...
Modelling-Beyond-Standard-Model-Physics
Modelling-Beyond-Standard-Model-Physics

Physics 722, Spring 2007 Final Exam Due Friday, May 11, 5pm
Physics 722, Spring 2007 Final Exam Due Friday, May 11, 5pm

e - Instituto de Física Facultad de Ciencias
e - Instituto de Física Facultad de Ciencias

... And their observables: proton decay, sparticles, neutrino masses and ...
QCD - Rahul I. Patel
QCD - Rahul I. Patel

thesis presentation
thesis presentation

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Assignment for Physics 295 – Professor Thomson – due May 2 2005

... on special relativity. He didn’t notice it straight away and thought it was curious! Note also that Einstein’s original paper on special relativity has no bibliography – he did not refer back to the work of a single previous physicist, mathematician or scientist. And that’s because nobody had ever p ...
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Glossary File
Glossary File

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Antonio Policicchio

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CDF @ UCSD Frank Würthwein Computing (finished since 8/2006

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Verre de Bragg et diagramme de phase des

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Nuclear and Hadron physics

... OUTLINE OF THE COURSE • Lecture 1: Hadron Physics. Experiments: new toys – new knowledge (progress in particle detector systems). Research areas: Hadron spectroscopy, meson rare decays (physics beyond SM), structure of hadrons. ...
Strong Electroweak Symmetry Breaking
Strong Electroweak Symmetry Breaking

... a “Mexican hat” depicting a potential for a particle (see figure 1.1) where a ball (particle) that is initially placed at the tip of the hat (maximum potential, i.e. at high energies) and is symmetric under rotations takes up a specific value when it tips off the top of the hat into the rim; the pic ...
View Commentary  - Journal Club for Condensed Matter Physics
View Commentary - Journal Club for Condensed Matter Physics

... and C. M. Varma, Phys. Rev. B 26, 4883 (1982)). The recent condensed matter realizations of the Higgs mode are associated with quantum phase transitions which are fully described by relativistic Lagrangians like those in (1) in both the ordered and disordered phases, and at the quantum critical poin ...
Presentazione di PowerPoint
Presentazione di PowerPoint

... In the Standard Model the weak and the electromagnetic interactions have been combined into a unified electroweak theory. At very short distances (10-18 m) the strength of the weak interaction is comparable to that of the electromagnetic. On the other hand, at thirty times that distance (3x10-17 m) ...
Quantum simulators of lattice gauge theories
Quantum simulators of lattice gauge theories

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Topological Charges, Prequarks and Presymmetry: a

Slide - Indico - Variable Energy Cyclotron Centre
Slide - Indico - Variable Energy Cyclotron Centre

... The Ultra Relativistic Quantum Molecular Dynamics (UrQMD) is a N-body transport model extensively used for describing heavy ion collisions of c.m. energy ranging from a few GeV/ nucleon to a few TeV/ nucleon. It includes 55 baryon species (up to mass 2.25 GeV) and 32 meson species (up to mass 1.9 G ...
Phil Anderson And Gauge Symmetry Breaking
Phil Anderson And Gauge Symmetry Breaking

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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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