Standard model Definition and 275 Threads

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...

DIMENSION THROW PROB. SPIN CHARGE NAME COMMENTS SUPER - - 1 -1 W- CLOUD - - 1 0 GLUON 1 2 1/36 ½ - 1/3 BOTTOM 2 3 1/18 ½ - 1 TAU 3 4 1/12 ½ - 1/3 STRANGE 4 5 1/9 ½ - 1 MUON OUR 5 6 5/36 ½ - 1/3 DOWN...

I was wondering: why is the SM always written with a Lagrangian? Couldn't you just as well write it with a Hamiltonian? The way I understand, the Lagrangian gives me the kinetic energy minus the potential energy (basically a measure for the "free energy", though not in the thermodynamical...

Which are the arguments against considering the possibility of the Standard Model as a TOE. Why do we need more particles or more degrees of freedom? It lacks, of course, a mechanism to get the SM from geometric considerations, or to get geometry from the SM. But it is almost a minor nuissance.

Hi all, I have been asked to give an informal presentation on the Standard Model to some chemists (note that this is not really my field of expertise ). I was wondering if there are some good (powerpoint) presentations out there that I could use to base mine on. That would save me a lot of...

Hi all, I've decided to read up on particle physics in my spare time for my own edification, but I've had some trouble locating a good textbook/survey paper with a succinct, technical and up-to-date description of the standard model. The text or two that i do have on hand were published in the...

http://www.lns.cornell.edu/spr/2003-10/msg0055587.html I think its a stroke of good luck that the SSC was canceled since otherwise it might have produced data that contradicted all the physics beyond the Standard Model that physicists now take for granted, and we would have to throw out...

I hate to risk additional distraction when we have so much thoughtful discussion---and add an additional thread when there are several good ones going, but I just came across a 15 October post at arxiv which I want to pass along, should anyone be interested. It is an 11-page article...

This is currently a hot topic, and I hope to get some discussion of it from our resident experts on stringy subjects. To start off here's a recent paper, maybe not the greatest but typical and fairly wide-ranging. If you know a better one, or a turorial on the subject why not favor us with a...

What is the standard model?