Standard model Definition and 258 Threads

Hi guys, Where can i find the most up to date (accurate) values of the standard model coupling strengths at the mass of the Z boson? Thanks Karnten07

I don't claim to be an expert of any kind, and most of these "problems" I see are probably just due to my own pre/misconceptions, but nonetheless: 1) As we get closer and closer to the Big Bang event, the universe is supposed to get hotter and denser until some sort of "infinity" where the...

I have a couple of questions about the standard model: 1.) I read somewhere that the standard model describes 3 closely related Yang-Mills systems, but i thought yang-mills systems were non-abelian whereas U(1) is abelian. So is the statement false or have i misunderstood? 2.)Why do i see...

Hi I know that our world is quite unstable and minor changes in these parameters could make the existence of life impossible. However, I am interested in what exactly is going to happen if we start to increase/decrease any of 30 parameters. It is interesting how well-tuned these parameters...

Neutrinos are elementary particles that have the ability to pass through any matter. Billions of them pass through our bodies every second. Billions of them pass through the Earth and exit on the other side unaffected. They can pass through stars and travel to the other side of the universe...

Where can someone find the entire standard model?

Every now and then one reads that the standard model does not work for energies above 1 or 2 TeV. Can anybody explain where this statement comes from? As far as I understand, there are no deviations of the standard model form experiment. There is only the issue of Higgs mass being...

A proposed MDM goes beyond the standard model in a minimal way, so as to produce a candidate for dark matter. Here is story from Nature News: http://www.nature.com/news/2008/080902/full/455007a.html Here is a key excerpt: ==quote== ...It now seems that some physicists have taken...

Does anyone know where to find the standard model of particle physics shown by Brian Cox in his LHC TED talk (found around 6:35 here: http://www.youtube.com/watch?v=_6uKZWnJLCM)? I'm looking to print out the equation but can't find it anywhere. Thanks

PBS “Ghost Particle” neutrinos showing Standard Model wrong Tonight and tomorrow (Sunday), PBS television is rebroadcasting “The Ghost Particle” on the neutrino work by John McCall and Ray Davis that showed the Standard Model Theory was wrong and made incorrect predictions about neutrinos...

Loll will deliver three one-hour talks at Oporto in mid July Here's the abstract Renate Loll, Quantum Gravity from Causal Dynamical Triangulations Abstract: I discuss motivation, implementation and results of the nonperturbative approach to quantum gravity based on Causal Dynamical...

M theory is an 11 dimensional theory which in some limits can reproduce all the five 10 dimensional string theories, and also 11D supergravity in some other limit. The mantra of string theory has been, for years, "we do not know what M-theory is". On the other hand, 11 dimensional space is...

At this point, i am not yet convinced that enough data is in on the subject of dark matter/dark energy to support expansion of the standard model to include them, but, then, i am just a lowly layperson... How do you guys see dark matter and dark energy fitting into the standard model? how...

So, what will we see at the LHC if the Standard Model is all that there is to physics at this energy scale? What if there is no supersymmetry, no strings, no loops (or at least no emergent behavior that would be seen here)? Are we going to be able to tell if those theories are false pretty...

Just looking for ideas if it does. I've looked at closed string tachyon condensation and it apparently excites the graviton as it's also closed string and this can warp spacetime. I (think) see a flaw in symmetry here as if I were on earth, feeling the gravitational field strength, I'd...

You are given a chance to fly back in time with no worry over changing history in bad ways. Knock knock and you enter a college looking for famous Isaac Newton, age 45, in person. He's a real fun in every way - mechanics, theory of gravity, celestial mechanics, calculus, the queen. Also he...

dark matter/virtual particles in standard model?? where do dark matter, dark energy, and virtual particles fit in the standard model? if those three mystifying concepts are necessary to explain the universe and its operation, why are they not included in the standard model? IMHO, all three...

We are pinning high hopes on LHC experiment. One of the expected results of the experiment is detection of Higgs Boson that would complete the standard model. In fact, discovery of Higgs Boson would complicate the theoretical issues because then we will need to find out.. a. origin of Higgs...

Hi I used the last few month two make me familiar with quantum mechanics and read two books. The Feynman lectures on physics and Principles of Quantum Mechanics (R. Shanker). I think I have no problems with the bra-ket notation and solving the Schroedinger equation for some simple particle...

Hi Is there anywhere a list of all constants (with their values) and fundamental equations (which can not be constructed from any other equations) of the standard model? thx einKI

Kea tells me that a good first book to read to learn category theory is Sets for Mathematics $45 F. William Lawvere and Robert Rosebrugh Advanced undergraduate or beginning graduate students need a unified foundation for their study of mathematics. For the first time in a text, this book...

Have there been any theories in recent decades that suggest one? Or more? I know it may seem unnecessary or even frivolous, but theories beyond the standard model are, after all, grappling with issues like how the entire universe and its four forces came to exist. Has anyone postulated a fifth...

Two interesting papers by Chan and Tsou on the hep-th arxiv: hep-ph/0611363 Title: Higgs Fields as Vielbeins of Internal Symmetry Space Authors: H.M. Chan, S.T. Tsou Comments: 24 pages An earlier suggestion that scalar fields in gauge theory may be introduced as frame vectors or...

"Beyond the Standard Model" hep-ph/0611279 Beyond the Standard Model Authors: Dmitri I. Kazakov Moscow 2006 Report-no: 2006 Review of recent developments in attempts to go beyond the Standard Model is given. We concentrate on three main unresolved problems: mechanism of electroweak...

I put a notice of this earlier today in the QG links thread https://www.physicsforums.com/showpost.php?p=1134904&postcount=529 https://www.physicsforums.com/showthread.php?p=1134904#post1134904 This thread is in case anyone wishes to discuss the paper: http://arxiv.org/abs/hep-th/0610241...

How is it not an exactly accurate understanding that QCD is a part/sector of the standard model of particle physics ? Or, it actually is?

how many propreties of particles of the standard model has lqg been able to describe within its conceptual framework, as opposed to string theory? recently i posted "lee smolin & standard model" evidently loop quantum gravity might be able to model some elementary particles properties...

http://www.newscientist.com/channel/fundamentals/mg19125645.800 sounds like string theory, all particles from vibrations. how successful has this theory been in comparison to string theory, on particle physics? "physical particles may seem very different from the space-time they inhabit, but...

No crackpot stuff her please, i would like a collection of known scientists thoughts that are beyond the standard model, Hawking has some good stuff :zzz: what are your favourites?

Berkeley writes : " Note that the dynamics of the Universe are not determined entirely by the geometry (open, closed or flat) unless the Universe contains only matter. In our Universe, where most of Omega comes from dark energy, this relation between the mass density, spatial curvature and...

Hello Folks! Though I have written my own paper (http://arxiv.org/abs/math.DG/0605709) , I am still a novice in Standard Model. Therefore, I have some questions for experts. The modules squares of the fermion wave functions are interpreted as the probability densities for the particles to...

Is the Standard Model overly speculative ... Or does it need intelligent, freer interpretation ...?-- cf "One part of the Standard Model is not yet well established. We do not know what causes the fundamental particles to have masses. The simplest idea is called the Higgs mechanism. This...

http://arxiv.org/abs/hep-th/0603022 Quantum Gravity and the Standard Model Sundance O. Bilson-Thompson, Fotini Markopoulou, Lee Smolin 12 pages, 21 figures "We show that a class of background independent models of quantum spacetime have local excitations that can be mapped to the first...

Standard Model help requested... Hi all, I hope this is the appropriate forum for asking about the Standard Model of particle physics. My formal education covered only chemistry, semiconductor physics, classical physics, special relativity, and introductory quantum mechanics. So my...

I had my first lecture on the Standard Model today. The lecturer presented the Lagrangian for the Standard Model, which took up two slides. However, it contained terms that referred explicitly to the Higgs field, whereas I was under the impression that the Standard Model didn't need the Higgs...

A few years ago BNL did some experiments measuring muon g-2. At the time there was a significant enough difference from the calculations based on the Standard Model to raise questions about SM. Since then I've seen papers indicating that SM was probably OK, with the discrepancy being due to...

Recently I have posted a preprint on the web (http://xxx.lanl.gov/abs/hep-ph/0502142) that contradicts the conclusion of the unification of electroweak interactions, which is the very reason the Standard Model is awarded Nobel prize. Before putting this preprint, I have asked as many...

A Geometric Approach to the Standard Model Greg Trayling, Dept of Phys, U. Windsor, Windsor, Ontario A geometric approach to the standard model of the Clifford algebra \mathcal{CL}_7 is advanced. The gauge symmetries and charge assignments of the fundamental fermions are seen to arise from a...

One way to achieve a degree of unification in physics would be to show how key aspects of the Standard Model of particle theory emerge from Loop Quantum Gravity. At the October QG conference Lee Smolin offered some ideas as to how that might happen. It involved having the links of the spin...

new preprint http://arxiv.org/abs/hep-th/0511086 Calabi-Yau Manifolds and the Standard Model John C. Baez 4 pages "For any subgroup G of O(n), define a "G-manifold" to be an n-dimensional Riemannian manifold whose holonomy group is contained in G. Then a G-manifold where G is the Standard Model...

Interesting post here http://motls.blogspot.com/2005/10/heterotic-mssm.html#comments It seems that a group of researchers has constructed a Calabi-Yau compactification that reproduces that particles of the standard model. The also obtain the SO(10) GUT group, and seem to get rid of some of...

I've heard electromagnetic wave propagation described as a 'swarm of photons'. This makes sense to me in terms of the standard model, wrt. the photon being the 'carrier particle' for electromagnetism. However, what about something with a static electric field - what's the 'carrier particle' for...

This is my (limited) understanding of particle physics: In particle physics gauge symmetries play an important role. To allow for massive gauge bosons this symmetry is broken. The theory of weak interactions can be derived from a local SU(2) symmetry, and quantumchromodynamics from a local SU(3)...

Hey guys, Just wondering if there is a single book / website / paper with the entire standard model in it to date. e.g one giant book with everything about classical physics (facts and equations) in it... what about one about the entire of Quantum Mechanics to date? I only ask because...

Would it be safe to say that according to the standard model of particle physics all that actually exists at the most fundamental level are leptons, quarks, and bosons?

gravity and the standard model and Higgs theory Massless particles always exist in a gravitational field, in the real universe.The standard model does not reflect this,so how can the standard model of particle physics be correct.And how can the Higgs theory of mass generation which is linked to...

What in simple terms is a Yang-Mills field? What has it got to do with the standard model of particle physics and why are all particles in the standard model massless - is this something to do with getting the standard model to be consistent with the Higgs field? Do we need the standard...

Has anyone got good pointed in higgs models beyond the minimal? The PDG review is too small for my taste. From Lamb's balance, I am getting the prediction of the following particle spectra 68 GeV. According L3, it could be H+ Z0 as usual, and W+ as usual, almost 115 GeV. According ALEPH...

Polemically speaking, if the standard model is so good, and we understand it so well, how come there are so many different explanations for the new theta pentaquark? What is that guy, anyway? All the best, Jim Graber

The Standard Model of particle physics provides no explanation for the masses of the basic particles. If the masses were much larger- a possibility for a variation of the model- then a small collection of particles could collapse in a black hole. Of course this universe would be different from...