Tagged Questions
4
votes
0answers
36 views
axial and vector resonances in composite higgs models
Is there a reason to believe that the axial resonances be heavier than the vector resonances in the composite higgs models?
For instance, in http://arxiv.org/abs/0808.2071, to have zero tree level ...
0
votes
0answers
57 views
How is the hierarchy problem consistent with the decoupling theorem?
One the one hand we have the hierarchy problem in it's various forms, in my understanding in it's most serious form one could state it as the observation that if there is a heavy mass scale M in ...
3
votes
1answer
93 views
Origin of Higgs ghosts
In M. Veltman's Diagrammatica, appendix E, one can find the full Standard Model lagrangian. Some sectors (e.g fermion-Higgs and weak sectors) contain so-called Higgs ghosts $\phi^+,\phi^-$ and ...
0
votes
1answer
264 views
What is the relationship between the Higgs field and quarks?
I have some difficulty considering the relative size of each and the meaning behind the shape of Higgs boson. I ask relating to the structures of both the Higgs field and quarks. How is it that the ...
5
votes
1answer
403 views
Higgs field questions
The Wikipedia article about Higgs field poses some questions to me.
The article says that the Higgs field is a "nonthermal" field, a field whose energy does not decrease as the universe expands, ...
6
votes
1answer
857 views
Measured Higgs mass and vacuum stability
There is such a thing, called "stability bound" on mass of the Higgs boson.
The basic idea (as I understand it) is that we take Higgs self-coupling, and calculate its renormalization running. And it ...
4
votes
2answers
383 views
Is the Higgs a quantum field or a particle?
The Higgs is not detected in the asymptotic data, so it is possible that there is no particle interpretation for the Higgs quantum field. Indeed, the Higgs potential is only positive definite if the ...
4
votes
4answers
954 views
What does spin 0 mean exactly?
I heard two definitions:
(1) Spin 0 means that the particle has spherical symmetry, without any preferred axis.
(2) The spin value tells after which angle of rotation the wave function returns to ...
1
vote
1answer
487 views
Yukawa Coupling of a Scalar $SU(2)$ Triplet to a Left-Handed Fermionic $SU(2)$ Doublet
Suppose we have a field theory with a single complex scalar field $\phi$ and a single Dirac Fermion $\psi$, both massless. Let us write $\psi _L=\frac{1}{2}(1-\gamma ^5)\psi$. Then, the Yukawa ...
1
vote
1answer
359 views
Origin of the Higgs field
Are there any attempts in the literature at addressing the origin of the Higgs field? And, which lines of research that find it inevitable to address this question?
5
votes
1answer
256 views
How do physicists know that mass of possible Higgs particle is limited between two values?
How do physicists know that mass of possible Higgs particle is limited between two values 90 GeV/c$^2$ and 145 GeV/c$^2$?
4
votes
2answers
596 views
Higgs mass and the hierarchy problem
I was wondering what is the opinion about importance of the hierarchy problem in the hep community? I'm still a student and I don't really understand, why there is so much attention around this issue. ...
8
votes
4answers
2k views
Why don’t photons interact with the Higgs field?
Why don’t photons interact with the Higgs field and hence remain massless?
0
votes
2answers
205 views
What is the interaction with Higgs field(s) that give the quarks so much different masses?
The masses of quarks are:
mu 2∼3 MeV md 4∼6 MeV
mc 1.3 GeV ms 80∼130 MeV
mt 173 GeV mb 4∼5 GeV
3
votes
1answer
305 views
Higgs Field compared to EM field
So, I've been reading about the Higgs because of all of this excitement lately with the LHC. I'm just a layman in physics but one thing I understood was that the Higgs field permeates all of space ...
9
votes
2answers
3k views
How does the Higgs mechanism work?
I'm not a particle physicist, but I did manage to get through the Feynman lectures without getting too lost.
Is there a way to explain how the Higgs field works, in a way that people like me might ...
7
votes
1answer
194 views
Is there literature on a continuous mass spectrum for the Higgs field?
Various masses for the Higgs field are compatible with experiment, but is it possible that the Higgs field is not observable because it has a continuous mass spectrum?
Work in the 60s and 70s on free ...
5
votes
3answers
287 views
bound states of massless fields?
Question: are they mathematically possible at all? physically?
with finite mass systems, usually the binding energy contributes to the rest-mass of the system. It would seem that even if you could ...
7
votes
1answer
381 views
Is there a rest frame for the Higgs boson?
If there is a non-zero expectation value for the Higgs boson even in "vacuum", since the Higgs boson has a mass unlike photons, then I would expect it to have a rest frame.
So why doesn't a non-zero ...
10
votes
2answers
2k views
Shape of the Higgs branching ratio to ZZ
I've been looking at the, now very popular, graph of the SM Higgs decay branching ratios:
You see that the ZZ branching ratio has a funny dip around the $170\, GeV$, very different from the WW ...
12
votes
2answers
1k views
Why isn't Higgs coupling considered a fifth fundamental force?
When I first learned about the four fundamental forces of nature, I assumed that they were just the only four kind of interactions there were. But after learning a little field theory, there are many ...
