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roflwaffle
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how do we "know" it must exist?
btw I am new here, don't flame me too hard
btw I am new here, don't flame me too hard
roflwaffle said:how do we "know" it must exist?
btw I am new here, don't flame me too hard
roflwaffle said:how do we "know" it must exist?
tom.stoer said:The question is not if there is something, but what it is exactly. Perhaps the Higgs is only a kind of effective degree of freedom, a quasi-particle like in condensed matter physics. A scalar particle is a stranger in the SM. Alternatives are wellcome
tom.stoer said:My idea is the following: the concept of sponaneous symmetry breaking and a condensate (= vacuum expectation value) is borrowed from condensed matter physics. But in condensed matter physics a condensate is never an effect from an elementary particle. There is a similar effect in QCD: the quark condensate [tex]<\bar{q}q>[/tex] serves as order parameter of the chiral symmetry (spontaneous breaking of the chiral symmetry goes hand in hand with the nearly massless pions, the corresponding Goldstone bosons).
But the Higgs is totally different, a stranger in the SM. It is the only scalar; its mass is affected by huge quantum corrections and it is by no means clear why it should not run towards the unification scale; it has a rather strange self-interaction; and last but not least there is no reason for a particle at all (all that is needed for the spontaneous symmetry breaking is a condensate that coupes to the other particles).
So why shouldn't it be possible that the Higgs is an effective degree of freedom, like a phonon or something like that? That would explain why it has such a strange potential which could be created by quantum fluctuations of the condensate.
tom.stoer said:I agree that its very hard to figure out something like that.
Technicolor as mentioned above is rather obscure. Strong binding (in order to hide the techni-quarks from us) requires high energy and would usually generate large masses - which is not what we observe.
I think we need something new.
Has anybody thought about a W- and Z-boson self-interaction?
Perhaps the interactiosn already present are sufficient. Afaik non-perturbative aspects haven't been investigated in much detail for SU(2)*U(1). Für QCD we know all these instantons etc., so perhaps we miss something in el.-weak theory.Parlyne said:I'm pretty sure that any self-interaction not already present in the SU(2)xU(1) gauge interactions would break the gauge symmetry sufficiently badly
tom.stoer said:Perhaps the interactiosn already present are sufficient. Afaik non-perturbative aspects haven't been investigated in much detail for SU(2)*U(1). Für QCD we know all these instantons etc., so perhaps we miss something in el.-weak theory.
OK, I agree.Parlyne said:See, for example, sphaelerons, which break baryon and lepton number conservation.
An instanton certainly not.Parlyne said:It's my understanding, however, that a gauge theory's instantons can't break the gauge symmetry.
Parlyne said:I'm pretty sure that any self-interaction not already present in the SU(2)xU(1) gauge interactions would break the gauge symmetry sufficiently badly that we wouldn't expect the observed relationship among the coupling strengths and W and Z masses.
tom.stoer said:Charges and coupling are not fixed; they are subject to running according to renormalization.
At low energies they are fixed by Fermi's theory, i.e. phenomenology, not by GSW. At high energies they may run, but of course this would not help as the masses we are talking about are low-enbergy phenomena.
First of all the W- and Z-bosons can be created in high-energy collisions as real particles. As W and Z are unstable they will decay, so they are not detectable directly but only via particles in their decay channels. It is possible via standard perturbation theory to calculate scattering cross-sections for W- and Z-production. Typically these cross sections show a peak near the W- and Z-mass which serves as a signature regarding particle production.Trenton said:Forget spin, symmetry and all that for one second. What I want to understand is how the W and Z bosons with something like 90 times the mass of a proton, come to exist. I know they only exist for trillionths of a trillionth of a second but they still exist.
What is going on here with specific reference to mass-energy equivalence?
Trenton said:... virtual particles not needing to respect E2 - p2 = m2 (and was that a typo?).
According to our model there is something, namely an elementary particle called Higgs-boson within a certain mass range. And we know (again in the context of our model) that we need some effect to generate particlemasses dynamically.zewpals said:... but for everyone who's stating that it's not a question of "if" there's something but "what"; you're wrong.
There IS something according to the modern model.
This is not just incorrect or a mild misunderstanding, it just shows that you have not thought about it before writing.zewpals said:everyone who's stating that it's not a question of "if" there's something but "what"; you're wrong.
I have a few bookmarks on thattom.stoer said:Does anybody know about a (complete) list of alternatives?
- technicolor
- top-quark condensate
- non-minimal coupling
- ...
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