Tagged Questions
5
votes
2answers
143 views
If helicity can suppress weak decay of $\pi^{\pm}$, doesn't that make chiralty observer dependent?
I have been under the impression that chirality is at least in part a way to sneak in a Lorentz invariant version of helicity for particles that mass. Flip Tanedo seems to espouse this view in a ...
4
votes
0answers
59 views
Are oscillations of electron chirality experimentally observable?
Is there any plausible experiment by which chirality oscillations in electrons could be observed experimentally, such as through some analogy to neutrino oscillation experiments?
0
votes
0answers
47 views
What causes the mass of Higgs boson itself? [duplicate]
Current theories stipulate that particles mass is due to :
Quantum chromodynamics (mutual attraction of quarks, i.e. gluon's kinetic energy, circa 98%) and Higgs field (quarks rest mass, circa 2%) ...
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 ...
5
votes
1answer
141 views
Why do some particles have a greater mass than others?
The property of mass that almost every particle possesses comes from the Higgs Field. It is this field, which permeates all of space, that particles interact with and hence obtain mass.
But why do ...
3
votes
0answers
70 views
What is the importance of the Higgs-strahlung process in the Higgs search?
I would particularly like to know why this process is considered the main search mode for Tevatron but useless for search at LHC.
0
votes
0answers
54 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
223 views
Higgs boson in LHC
Recently,the higgs bosons are discovered in LHC. My question is
How did they come to know that the particle that are created are actually Higgs boson?
On the basis of which properties,they ...
5
votes
1answer
176 views
Spin of Higgs boson 125 GeV
Can someone please explain to me why (according to decay of Higgs boson into 2 photons) Higgs boson cannot have s=1?
Thanks in advance
4
votes
2answers
256 views
Basic question on experimental plots
On the following Higgs $\rightarrow$ Tau Tau plot, since we are plotting the ratio of $\frac{\sigma}{\sigma_{SM}}$ on the y axis, shouldn't the expected for this be 1? i.e., shouldn't the expected 68% ...
5
votes
2answers
249 views
Was the Higgs mass correctly predicted by asymptotic safety of gravity?
This paper was published in Phys Lett B in 2009, and predicted the Higgs mass to be 126 GeV based on the asymptotic safety of gravity. Is this prediction taken seriously by the theory community, or is ...
2
votes
1answer
129 views
Is this a good explanation of the Higgs mechanism? [duplicate]
Possible Duplicate:
Is there an accepted analogy/conceptual aid for the Higgs field?
A video I watched explains the Higgs mechanism as follows.
Take massless particles. These can only ever ...
3
votes
1answer
121 views
Do Maxwell equeations change somehow after Higg's boson finding?
When I was in some physics -lesson, probably something to do with Quantum Physics -- the teacher said that certain Maxwell equations would change if the Higg's boson is found. It is also possible that ...
5
votes
3answers
222 views
Higgs Boson: The Big Picture
First, please pardon the ignorance behind this question. I know a fair amount of math but almost no physics.
I'm hoping someone can give me a brief "big picture" explanation of how physicists were ...
4
votes
2answers
235 views
Vector Boson Fusion
I have been reading about the production mechanisms for the Higgs at the LHC. It is always mentioned that for Vector Boson Fusion, the initial quarks cause jets that are back to back and with a higher ...
0
votes
0answers
57 views
What is Higgs transition?
In recent publications there is a frequent mentioning of the so-called "Higgs transition" in connection with magnetic monoples. Can anybody please describe the phenomenon in simple terms?
For ...
1
vote
1answer
136 views
What are hadrons anyway?
I'm new to this particle physics field. What are hadrons and does they have any relation with Higgs Boson, which is now being talked everywhere as "THE GOD PARTICLE".
5
votes
2answers
409 views
How do we distinguish between virtual particle exchange and particle decay?
The difference between virtual particles and unstable particles is discussed at length in this question (namely, virtual particles correspond to internal lines in Feynman diagrams and are not ...
3
votes
2answers
226 views
Why are particles different sizes?
Is it correct in saying that a particles size is it's rest energy, and that particles don't actually have size (in the way you get different size objects)?
What defines what sizes a particle can be? ...
1
vote
0answers
56 views
Higgs boson and other properties of particles. [duplicate]
Possible Duplicate:
Why do we need Higgs field to re-explain mass, but not charge?
Why have scientists been looking for something to give mass to particles, but not looking for something to ...
0
votes
0answers
99 views
How the God particle will change our perception to the universe? [closed]
I just wonder finding the God particle how will change our minds?
4
votes
2answers
179 views
What has been measured at the Higgs experiment and what do we know now?
Explained at the level of a 5$^{\text {th}}$ semester physics student (i.e. pre QFT, but far beyond the level of a news article for non-physicists, which avoids all details and only deals in ...
7
votes
1answer
373 views
Is the Higgs mechanism a fundamental interaction?
Is the Higgs mechanism a fundamental interaction of the same standing as the strong, weak and electromagnetic interactions? If not, is it mediated by the weak interaction? It seems that all the ...
9
votes
2answers
704 views
What happens to matter in a standard model with zero Higgs VEV?
Suppose you reset the parameters of the standard model so that the Higgs field average value is zero in the vacuum, what would happen to standard matter?
If the fundamental fermions go from a finite ...
7
votes
2answers
298 views
How do you find spin of a particle from experimental data?
So I was wondering, with all this Higgs talk going on, they just detected a particle with a mass of 125 GeV (CMS) or 126.5 GeV (ATLAS). But they still don't know what it is, since there is tons of ...
3
votes
1answer
85 views
Measuring tensor rank of the Higgs resonance
The Higgs boson is the first scalar field ever measured that is fundamental rather than composite. How do high-energy physicists determine that a given resonance in the statistics is either a scalar, ...
9
votes
2answers
2k views
What does the discovery of the Higgs Boson mean for physics?
Will this unite some theories, or cause some other change in physics, and perhaps our undertanding of the universe?
10
votes
2answers
1k views
Higgs Boson mass in Electron volts?
Im no physics genius here, I was just interested in the Higgs Boson so I was reading this article : How the Discovery of the Higgs Boson Could Break Physics
I came across this
Furthermore, ...
4
votes
4answers
935 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 ...
2
votes
1answer
219 views
Has the Higgs really been discovered at CERN?
Many news media round the world such as this http://www.scientificamerican.com/article.cfm?id=higgs-lhc have reported the possible discovery of the Higgs at CERN, to be announced at a conference on ...
2
votes
2answers
179 views
What evidence is there for the electroweak higgs mechanism?
The wikipedia article on the Higgs mechanism states that there is overwhelming evidence for the electroweak higgs mechanism, but doesn't then back this up. What evidence is there?
1
vote
1answer
357 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?
4
votes
2answers
193 views
Higgs boson and quasiparticles
Do we know exactly the difference between particles and quasiparticles? Is Higgs boson a particle or a quasiparticle? I ask this because if I understood well, Higgs boson created by a spontaneaous ...
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$^2$?
3
votes
1answer
220 views
Where is the “true” higgs if the LHC 125 GeV signal is rather a higher dimensional radion than a SM higgs?
In this article, Lumo introduces and explains the idea (presented by the original authors in this paper) that the LHC signal at about 125 GeV could alternatively be interpreted as a higher ...
7
votes
2answers
1k views
Why is the Higgs boson spin 0?
Why is the Higgs boson spin 0? Detailed equation-form answers would be great, but if possible, some explanation of the original logic behind this feature of the Higgs mechanism (e.g., "to provide ...
1
vote
1answer
456 views
How can a Higgs decay to heavier products than its mass?
How is it possible that a higgs at ~125 GeV can decay into 2 W bosons @ ~ 80 GeV a piece (for example)? Shouldn't a particle only be allowed to decay to lighter particles + energy?
Diagram copied ...
0
votes
2answers
203 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
5
votes
2answers
226 views
What's the difference between “evidence of a new particle” and “discovery of a new particle”?
Today’s exciting press release from Tevatron on the Higgs boson keeps its head cool and say that physicists saw a “hint” of the Higgs boson because the signal is barely above the two-sigma level. In ...
5
votes
0answers
74 views
$WW\to t\bar{t}$ growth
I was told recently that "it is well known that processes like $WW\to t\bar{t}$ ($t$ being a top, or any massive fermion) grows linearly with the energy in the absence of an Higgs boson." Does anyone ...
8
votes
1answer
330 views
Could LEP II have discovered a 125GeV Higgs?
LEP II eliminated the Higgs up to 114.5GeV. If it had been run for longer could it have detected a Higgs at 125GeV?
I Googled for this without any luck, though I did find a comment that LEP II topped ...
3
votes
1answer
259 views
What are the advantages of the ILC over the LHC?
USA Today has an article on Japan's interest as the site for the $10 billion future International Linear Collider. This accelerator will utilize electron/positron collisions (like CERN's former LEP ...
2
votes
0answers
188 views
Has CERN recently found evidence for a Z-prime boson?
In the recent Higgs seminar at 73:38 Guido Tonelli the spokesman for CMS, makes a mistake and refers to a Z-prime in a context that would imply that they see them frequently. He swiftly backpedals ...
8
votes
2answers
2k views
Higgs boson and string theory
Assuming Higgs is found at 125 GeV.Is there any direct or indirect consequence on string theory ? Will it be a blow to string theory or models employing string theory ?
...
6
votes
1answer
96 views
Status of the little hierarchy problem
What is the current thinking on the little hierarchy problem in light of a potential Higgs mass above 120 GeV? A few years ago, at least, I remember various phenomenologists saying that this at least ...
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 ...
3
votes
4answers
582 views
What if we could give photons some mass?
I was reading an article and these paragraphs got me wondering...
Before I list the replies, here is some background. The Higgs mechanism describes an invisible field that, it is argued, split one
...
10
votes
2answers
69 views
ATLAS Higgs Interpretation
I came across this abstract, and I am curious as to what the ATLAS Team has actually discovered:
Abstract Motivated by the result of the Higgs boson candidates at LEP with a mass of about ...
3
votes
2answers
552 views
What are the implications for quantum gravity if the LHC sees no higgs?
Following the news in serious "non-hype" physics blogs I`ve learnd that as things are now one needs a lot of patience and more data to learn what happens in the higgs sector.
There are already a ...
12
votes
3answers
688 views
So, no Higgs boson then?
There are a lot of articles being posted in the wake of a CERN announcement that they have not observed the Higgs boson in the range of energies so far searched (between 145 and 466 billion eV), e.g. ...
