unification of couplings
... In a more precise treatment we would actually have to worry about the spectrum of weak hypercharges, which is even worse. One of us (Wilczek) recalls that as a graduate student he considered the now standard SU(2)xU(l) model of electroweak interactions to be "obviously wrong" just because it require ...
... In a more precise treatment we would actually have to worry about the spectrum of weak hypercharges, which is even worse. One of us (Wilczek) recalls that as a graduate student he considered the now standard SU(2)xU(l) model of electroweak interactions to be "obviously wrong" just because it require ...
The Weak Force: From Fermi to Feynman
... to propagate, like the photons, with the speed of light. In any case their penetrating power exceeds many times that of photons of the same energy. It seems to me admissible that the neutrinos have spin 12 and that they obey Fermi statistics, even though experience does not provide us with any direc ...
... to propagate, like the photons, with the speed of light. In any case their penetrating power exceeds many times that of photons of the same energy. It seems to me admissible that the neutrinos have spin 12 and that they obey Fermi statistics, even though experience does not provide us with any direc ...
SUPERSYMETRY FOR ASTROPHYSICISTS
... Jonathan Feng University of California, Irvine 30 Jul – 1 Aug 07 ...
... Jonathan Feng University of California, Irvine 30 Jul – 1 Aug 07 ...
PX430: Gauge Theories for Particle Physics
... Q7 Derive the symmetry current associated with the SU(2) gauge symmetry. [hint: refer to the discussion of complex scalar fields in Handout 3.] The presence of the Pauli matrices τj , previously encountered in quantum mechanics, suggests that this symmetry has something to do with spin. Indeed, glob ...
... Q7 Derive the symmetry current associated with the SU(2) gauge symmetry. [hint: refer to the discussion of complex scalar fields in Handout 3.] The presence of the Pauli matrices τj , previously encountered in quantum mechanics, suggests that this symmetry has something to do with spin. Indeed, glob ...
Ellis-part1
... Status of the Standard Model • Perfect agreement with all confirmed accelerator data • Consistency with precision electroweak data (LEP et al) only if there is a Higgs boson • Agreement seems to require a relatively light Higgs boson weighing < ~ 180 GeV • Raises many unanswered questions: mass? fl ...
... Status of the Standard Model • Perfect agreement with all confirmed accelerator data • Consistency with precision electroweak data (LEP et al) only if there is a Higgs boson • Agreement seems to require a relatively light Higgs boson weighing < ~ 180 GeV • Raises many unanswered questions: mass? fl ...
1 Press release Brussels, 8 October 2013 Nobel Prize for
... unify these two types of interactions, by giving a mass to the particles carrying the weak interaction. This mechanism would also, more generally, explain the origin of the mass of all elementary constituents of matter, and thus provide a key element in the construction of the "Standard Model" of el ...
... unify these two types of interactions, by giving a mass to the particles carrying the weak interaction. This mechanism would also, more generally, explain the origin of the mass of all elementary constituents of matter, and thus provide a key element in the construction of the "Standard Model" of el ...
Aran Sivaguru Dissertation
... Although the neutron has a distinct anti-particle, this is not true for all neutral particles. Some neutrally charged particles can be their own anti-particle. For example, bosons such as the photon (spin-1) and the graviton (spin-2). These particles are created by fields that are their own complex ...
... Although the neutron has a distinct anti-particle, this is not true for all neutral particles. Some neutrally charged particles can be their own anti-particle. For example, bosons such as the photon (spin-1) and the graviton (spin-2). These particles are created by fields that are their own complex ...
Proposal for a topological plasmon spin rectifier
... topological insulator nanostructure induces a static spin accumulation in a resonant, normal metal structure coupled to it. Using a finite-difference time-domain model, we simulate this spin-pump mechanism with drift, diffusion, relaxation, and precession in a magnetic field. This optically driven s ...
... topological insulator nanostructure induces a static spin accumulation in a resonant, normal metal structure coupled to it. Using a finite-difference time-domain model, we simulate this spin-pump mechanism with drift, diffusion, relaxation, and precession in a magnetic field. This optically driven s ...
Majorana returns - MIT Center for Theoretical Physics
... language of quantum field theory. In quantum field theory, if a given field φ creates the particle A (and destroys its antiparticle Ā), the complex conjugate φ* will create Ā and destroy A. Particles that are their own antiparticles must be associated with fields obeying φ = φ*, that is, real fields ...
... language of quantum field theory. In quantum field theory, if a given field φ creates the particle A (and destroys its antiparticle Ā), the complex conjugate φ* will create Ā and destroy A. Particles that are their own antiparticles must be associated with fields obeying φ = φ*, that is, real fields ...
LHC Physics - UCL HEP Group
... to “4 jets + missing energy” – Measure background in control region – Extrapolate to signal region – Look for excess in signal region ...
... to “4 jets + missing energy” – Measure background in control region – Extrapolate to signal region – Look for excess in signal region ...
New insights into soft gluons and gravitons. In
... are usually referred to as infrared (IR) divergences, and the gluons themselves as soft, to distinguish them from the hard emitting particles that emerge from the interaction. Such gluons may be real or virtual, and the above remarks make clear that IR divergences are a general feature of quantum fi ...
... are usually referred to as infrared (IR) divergences, and the gluons themselves as soft, to distinguish them from the hard emitting particles that emerge from the interaction. Such gluons may be real or virtual, and the above remarks make clear that IR divergences are a general feature of quantum fi ...
Terrestrial Energy Frontier: TEVATRON Searches for Higgs and Supersymmetry
... All predict new particles, that can be looked for directly or in loop effects Yuri Gershtein SSI-2008 ...
... All predict new particles, that can be looked for directly or in loop effects Yuri Gershtein SSI-2008 ...
Supersymmetry (SUSY)
... A Lorentz scalar only has integer valued angular momentum but fermions also have 1/2 integer spin in addition to orbital angular momentum. Need Spin operator ...
... A Lorentz scalar only has integer valued angular momentum but fermions also have 1/2 integer spin in addition to orbital angular momentum. Need Spin operator ...
This article was downloaded by:[Michigan State University Libraries]
... Once having established that the character of electroweak symmetry breaking is a compelling issue, we will consider where the crucial information should be found. The electroweak theory itself points to the energy scale around 1 TeV, or 1012 eV, and other considerations also single out the 1 TeV sca ...
... Once having established that the character of electroweak symmetry breaking is a compelling issue, we will consider where the crucial information should be found. The electroweak theory itself points to the energy scale around 1 TeV, or 1012 eV, and other considerations also single out the 1 TeV sca ...
Recent Developments in String Theory
... kinds of neutrinos, and e the electron). The fourth known interaction force of nature, which is gravity, is traditionally not viewed as belonging to particle physics. ...
... kinds of neutrinos, and e the electron). The fourth known interaction force of nature, which is gravity, is traditionally not viewed as belonging to particle physics. ...
like in Arts - Physik und Astronomie an der Universiteat Innsbruck
... Sabine Kraml Christian Weber – fixed term pos. Karol Kovařík – PhD student Wilhelm Öller – PhD student ...
... Sabine Kraml Christian Weber – fixed term pos. Karol Kovařík – PhD student Wilhelm Öller – PhD student ...
PowerPoint
... Dynamical Chiral Symmetry Breaking with Nonet Scalar Mesons as Composite Higgs Bosons and Predictions for Mass Spectra of Lowest Lying Mesons Chiral Thermodynamic Model of QCD and QCD Phase Transition with Chiral Symmetry Restoration Predictive Realistic Holographic AdS/QCD Model for the Mass Sp ...
... Dynamical Chiral Symmetry Breaking with Nonet Scalar Mesons as Composite Higgs Bosons and Predictions for Mass Spectra of Lowest Lying Mesons Chiral Thermodynamic Model of QCD and QCD Phase Transition with Chiral Symmetry Restoration Predictive Realistic Holographic AdS/QCD Model for the Mass Sp ...
2+1 Abelian `Gauge Theory' Inspired by Ideal Hydrodynamics
... more well-known ones listed in the last paragraph. As a toy-model in this direction, we seek a gauge theory where the gauge fields satisfy a closed Poisson algebra, without any need for electric fields. We want a theory whose phase-space is a coadjoint orbit of an ordinary diffeomorphism group, whic ...
... more well-known ones listed in the last paragraph. As a toy-model in this direction, we seek a gauge theory where the gauge fields satisfy a closed Poisson algebra, without any need for electric fields. We want a theory whose phase-space is a coadjoint orbit of an ordinary diffeomorphism group, whic ...
Higgs boson and EW symmetry breaking
... Our map fragment from the SM experiments of the past two decades may give a sensible guide for future exploration – not for details, but to tell us that we are poised to make new discoveries on the coming voyages. ...
... Our map fragment from the SM experiments of the past two decades may give a sensible guide for future exploration – not for details, but to tell us that we are poised to make new discoveries on the coming voyages. ...
Particle Physics in the LHC Era - SUrface
... that some particle may decay in a way that we have not yet seen. We could continue to enumerate all the possible ways that we have it worse off, however it is not all bad, and there is one way we are much better off than the case of the chess game. It turns out there is quantitative meaning to being ...
... that some particle may decay in a way that we have not yet seen. We could continue to enumerate all the possible ways that we have it worse off, however it is not all bad, and there is one way we are much better off than the case of the chess game. It turns out there is quantitative meaning to being ...
why do physicists think that there are extra dimensions
... an extra dimension of space just means new degrees of freedom of a certain type (Kaluza-Klein modes). but we already have discovered examples in string theory (e.g. AdS/CFT) where new degrees of freedom can be interpreted either as an extra dimension or as new dynamics without an extra dimension! ...
... an extra dimension of space just means new degrees of freedom of a certain type (Kaluza-Klein modes). but we already have discovered examples in string theory (e.g. AdS/CFT) where new degrees of freedom can be interpreted either as an extra dimension or as new dynamics without an extra dimension! ...
aps_2003
... breaking (Higgs) physics and some part of the new physics (SUSY etc.), but not all. However, the initial state has a fixed cm energy and welldefined quantum state. The processes are simple, and rates and backgrounds are low. The LC will provide the detailed and precise information to sort out the ne ...
... breaking (Higgs) physics and some part of the new physics (SUSY etc.), but not all. However, the initial state has a fixed cm energy and welldefined quantum state. The processes are simple, and rates and backgrounds are low. The LC will provide the detailed and precise information to sort out the ne ...
ppt - 2005 Taipei Summer Institute on Strings, Particles and Fields
... (talk by S. Mishima at Super B WSII, Hawaii April 2005) ...
... (talk by S. Mishima at Super B WSII, Hawaii April 2005) ...
Superstring Theory
... charge except spin before the super symmetry is broken. • So for example the super partner of an electron would have zero spin and is called a selectron. An electron is a fermion and selectron is a boson. • “Results from the Large Hadron Collider (LHC) have all but killed the simplest version of an ...
... charge except spin before the super symmetry is broken. • So for example the super partner of an electron would have zero spin and is called a selectron. An electron is a fermion and selectron is a boson. • “Results from the Large Hadron Collider (LHC) have all but killed the simplest version of an ...
An Exceptionally Simple Theory of Everything
""An Exceptionally Simple Theory of Everything"" is a physics preprint proposing a basis for a unified field theory, very often referred to as ""E8 Theory"", which attempts to describe all known fundamental interactions in physics and to stand as a possible theory of everything. The paper was posted to the physics arXiv by Antony Garrett Lisi on November 6, 2007, and was not submitted to a peer-reviewed scientific journal. The title is a pun on the algebra used, the Lie algebra of the largest ""simple"", ""exceptional"" Lie group, E8. The paper's goal is to describe how the combined structure and dynamics of all gravitational and Standard Model particle fields, including fermions, are part of the E8 Lie algebra. In the paper, Lisi states that all three generations of fermions do not directly embed in E8 with correct quantum numbers and spins, but that they might be described via a triality transformation, noting that the theory is incomplete and that a correct description of the relationship between triality and generations, if it exists, awaits a better understanding.The theory received accolades from a few physicists amid a flurry of media coverage, but also met with widespread skepticism. Scientific American reported in March 2008 that the theory was being ""largely but not entirely ignored"" by the mainstream physics community, with a few physicists picking up the work to develop it further.In a follow-up paper, Lee Smolin proposed a spontaneous symmetry breaking mechanism for obtaining the classical action in Lisi's model, and speculated on the path to its quantization.In July 2009, Jacques Distler and Skip Garibaldi published a critical paper in Communications in Mathematical Physics called ""There is no 'Theory of Everything' inside E8"", arguing that Lisi's theory, and a large class of related models, cannot work. They offer a direct proof that it is impossible to embed all three generations of fermions in E8, or to obtain even the one-generation Standard Model without the presence of an antigeneration. In response to Distler and Garibaldi's paper, Lisi argued, in a new paper ""An Explicit Embedding of Gravity and the Standard Model in E8"", peer reviewed and published in a conference proceedings, that some assumptions about fermion embeddings are unnecessary and that the antigeneration is not by itself a problem sufficient to rule out the one-generation Standard Model. In December 2010 and May 2011, Lisi wrote in the popular magazine Scientific American a feature article on the E8 Theory of Everything and an entry in the blog section of the magazine addressing some of the criticism of his theory and how it has progressed, noting that the theory is still incomplete and makes only tenuous predictions, with the three generation issue remaining as a significant problem.