Neutrinos are light, uncharged leptons. The neutrino tag should be applied to question relating to neutrino properties or interactions involving neutrinos.
0
votes
1answer
96 views
Neutrinos and Speed of light
Einstein's Special Theory of relativity postulates that the speed of light is same for all frames.
Suppose a neutrino is there moving at the speed of light. Then will that neutrino also be flowing ...
25
votes
1answer
502 views
Neutrinos vs. Photons: Who wins the race across the galaxy?
Inspired by the wording of this answer, a thought occurred to me. If a photon and a neutrino were to race along a significant stretch of our actual galaxy, which would win the race?
Now, neutrinos ...
5
votes
3answers
647 views
How can neutrinos “beat light”?
Article in the CERN newsletter "symmetry breaking" has the following statement:
"Neutrinos are often the first particles to bring news of events in space to Earth, beating even light.". What does this ...
16
votes
1answer
287 views
Where do high-energy neutrinos come from?
Last week the IceCube South Pole Neutrino Observatory published a press release reporting the possible discovery of two neutrinos with energies of over 1 PeV.
Would anyone here be willing to help me ...
2
votes
0answers
30 views
Do small-angle coherent scattering experiments really see coherent effects over arbitrarily large distances?
Short version
After integrating over all possible outgoing angles, the total cross-section of coherent elastic scattering from a fixed target of characteristic length $L$ scales like $L^4$. Does ...
2
votes
0answers
61 views
About the seesaw mechanism
I was reading about the seesaw mechanism in my Lecture notes and got a technical question. See for example
http://www.lhep.unibe.ch/img/lectureslides/9_2007-11-30_SeeSawMechanism.pdf
page 13.
There ...
1
vote
0answers
24 views
Effective amplitude in Neutrinoless double beta decay
Can someone give me the value of the effective amplitude($A$) of $\bar{\nu_\mu}\rightarrow\nu_\mu$ oscillation of Neutrinoless double beta decay? The expression is like this:
...
5
votes
2answers
118 views
Do neutrinos of any flavor get trapped in black holes?
This question has been bothering me a bit. I know that neutrinos have super small mass and they interact via the weak force. Since they have a non-zero mass, they should be affected by black holes and ...
2
votes
0answers
37 views
How to get from angular velocity to acquired phase for neutrino oscillations in matter?
I am reading Akhmedovs 2000 paper on parametric resonance, and I cannot figure out the math of this particular passage:
The difference of the neutrino eigenenergies in a matter of density $N_i$ is ...
1
vote
2answers
98 views
Can the speed of an electromagnetic wave be measured in the absence of neutrinos?
Let me explain better: from what I understand neutrinos are so pervasive they are literally everywhere. And since they have such a tiny electric charge they barely interact with anything and cannot be ...
2
votes
2answers
108 views
How much energy is carried away by neutrinos in matter-antimatter annihilation?
Some people say that neutrinos carry away most of the energy, some others say just a fraction. So what is the truth ? what is the percentage of energy lost due to neutrinos ?
2
votes
0answers
79 views
Question on “new CNGS/OPERA measurement of neutrino velocity” (hep-ex/1212.1276)
A "new measurement of the limit on muon neutrino velocity with respect to the speed of light " by the OPERA neutrino experiment in collaboration with CERN has become public recently, as preprint ...
0
votes
2answers
251 views
How neutrinos can be harmful?
What are the circumstances in which neutrinos can harm humans or even kill them.?
5
votes
1answer
101 views
Mechanisms of mass generation for Dirac neutrinos
If neutrinos are Majorana particles, one way of explaining their small masses is the seesaw mechanism.
Now say I'd like my neutrinos to be Dirac, for symmetry to the quark sector. What mechanisms ...
2
votes
2answers
108 views
What is difference between the different 'flavours' of neutrinos?
Moreover, how-come scientist know that muon-neutrino are different from electron-neutrino when they didn't even know what the difference was? Did they interact differently with other particles?
0
votes
0answers
122 views
Neutrino mass with Dirac and Majorana
Why both Dirac mass and Majorana mass terms are needed to explain the mass of a neutrino?
2
votes
1answer
225 views
How 'Faster Than Light' Neutrino Was Product of Loose Cable at CERN?
A "faster than light" neutrino discovery was actually the result of a loose cable.
A fiber-optic cable in a GPS receiver at the European Center for Particle Physics ( CERN) near Geneva
Can someone ...
4
votes
1answer
55 views
Is it proven that all “solar” neutrinos are coming from the Sun direction?
In "Observation of 8B solar neutrinos in the Kamiokande-II detector" (Phys.Rev.Lett., 63, 16(1989), http://prl.aps.org/pdf/PRL/v63/i1/p16_1) the Figure 2 shows that only small percentage of registered ...
0
votes
1answer
185 views
Does a coronal mass ejection change solar neutrino emission rates?
Does the CME and neutrinos have any relation? CME is measured by Corona graphs.. How do they measure neutrinos coming from the sun? Does any of these have effects on earth's magnetic field or ...
10
votes
1answer
131 views
The transit of Venus and solar neutrino rates
The following question was posed at the end of Maury Goodman's June 2012 long-baseline neutrino newsletter.
During the Venus transit of the sun, were more solar neutrinos
absorbed in Venus, or ...
1
vote
3answers
168 views
Neutron decay and electron anti neutrino $n\to p + e + \bar{\nu}_e$
Why do we need neutrino to explain neutron decay?
Is there any evidence regarding existence neutrinos in the context of
$n\to p + e + \bar{\nu}_e$?
0
votes
0answers
29 views
Can neutrinos be the dark matter [duplicate]
Possible Duplicate:
How do we know Dark Matter isn't simply Neutrinos?
If there are primardian neutrinos and since they have some mass however low, could neutrinos form the dark matter ...
0
votes
0answers
24 views
Neutrinos and the Cosmic Speed Limit [duplicate]
Possible Duplicate:
Superluminal neutrinos
An article in the newspaper a few months ago said that Neutrinos travel faster than Light. Another article then said that this observation was ...
2
votes
3answers
148 views
When a high speed neutrino just misses an old neutron star, why isn't it trapped?
Suppose a neutrino is seen travelling so fast that its Lorentz gamma factor is 100,000. It races past an old, no longer active neutron star, narrowly missing it. As far as the neutrino is concerned, ...
8
votes
1answer
256 views
Are right handed neutrinos actually antineutrinos and vice versa?
Is it experimentally ruled out that right-handed neutrinos are actually antineutrinos, and left-handed antineutrinos are neutrinos ?
3
votes
1answer
100 views
Neutrino Oscillation and their gravitational implications
As I understand neutrinos, there are three different flavors, all with different masses. Although the masses of these neutrinos have not been directly measured, their mass differences have been. ...
-1
votes
2answers
173 views
When Physicists thought neutrinos were faster than the speed of light [duplicate]
Possible Duplicate:
Superluminal neutrinos
I remember not too long ago hearing very much speculation about a discovery that perhaps neutrinos are faster than the speed of light.
I've heard ...
0
votes
1answer
133 views
“Conceptualizing” neutrinos
Layman here. EE and BS physics. I am "content" in viewing photons/electromagnetic radiation as an "emergent" property of spacetime? due to the electrons ("particles..?") and all their activity jumping ...
2
votes
2answers
613 views
Are neutrinos affected by gravity?
Layman here, but EE and BS physics. I know that light is affected by gravity. But are neutrinos? During the collapse of a star into a neutron star, as the electrons join protons to form neutrons ...
-3
votes
1answer
104 views
Why is neutrino beam not considered light?
I am trying to understand why physicists consider a neutrino beam not to be light.
Here's the research that I did to find the answer:
...
1
vote
1answer
88 views
Neutrino beam energy
Neutrino is one of the most mysterious particles in todays physics. Even when values of some parameters like for example mass associated with it are not known (or there is great range of possible ...
0
votes
3answers
85 views
Units describing the behavior of neutrinos
http://proj-cngs.web.cern.ch/proj-cngs/Download/CNGSDGVE/cngsdgve.pdf
on page 13 I read that "the present plan is to provide nu_mu neutrinos with an energy between 5 and 30 GeV."
Wikipedia neutrino ...
0
votes
0answers
92 views
OPERA' s chief resigns [closed]
It was said that the chief of the experiment (that proposedly demonstrated faster than light behavior) resigned after a vote. What good justification could there be for voting him out of his position? ...
1
vote
2answers
206 views
Neutrino and electromagnetic forces
I learned from Wikipedia that neutrinos "are not affected by the electromagnetic forces". How was this identified experimentally?
6
votes
2answers
323 views
Neutrino oscillations versus CMK quark mixing
I wish to describe in simple but correct terms the analogy between the Cabibbo–Kobayashi–Maskawa (CMK) and Pontecorvo–Maki–Nakagawa–Sakata (PMNS) matrices.
The CMK matrix describes the rotation ...
5
votes
2answers
552 views
“Dear radioactive ladies and gentlemen” - Letter by Wolfgang Pauli
In 1930, Wolfgang Pauli wrote a letter to Lise Meitner for a convention in Tübingen, considering the problem of beta decay.
Does anybody know, where to find the original letter online ?
4
votes
3answers
181 views
Could we prove that neutrinos have mass by measuring their gravitational signature?
It is now said that neutrinos have mass. If an object has mass then it also emits a gravitational field. I appreciate the neutrinos mass is predicted to be small, but as there are so many produced ...
9
votes
1answer
237 views
Neutrino Oscillations and Conservation of Momentum
I would like to better understand how neutrino oscillations are consistent with conservation of momentum because I'm encountering some conceptual difficulties when thinking about it. I do have a ...
1
vote
1answer
192 views
Light vs neutrino speed comparison in a real tunnel
Given current accuracy of the techniques, is it possible to identify a real, existing tunnel (stright I think) to make the direct comparison of the speed of light and of neutrinos?
The hypotetical ...
4
votes
4answers
500 views
When the speed of light has been measured, recently?
Yes, it is weird, absurd, but I can't stop thinking that the would-be superluminal
neutrino speed has been computed by an arithmetic operation (space/time) and not by direct comparison with a ...
9
votes
3answers
638 views
Why do or don't neutrinos have antiparticles?
This was inspired by this question. According to Wikipedia, a Majorana neutrino must be its own antiparticle, while a Dirac neutrino cannot be its own antiparticle. Why is this true?
5
votes
1answer
130 views
Are there any reasonable attempts at explaining the OPERA result
as there's so many papers on the opera result and it's a struggle flicking through them all combined with my limited knowledge meaning I cannot well differentiate silly nonsensical papers from ones ...
4
votes
2answers
396 views
Consequences for causality if superluminal neutrinos were explained by extra dimensions
One suggestion for explaining superluminal neutrinos (assuming for the sake of argument that the OPERA results should hold up) is that the neutrinos have taken a route through extra dimensions, with ...
16
votes
3answers
717 views
How do we know Dark Matter isn't simply Neutrinos?
What evidence is there that dark matter isn't one of the known types of neutrinos?
If it were, how would this be measurable?
1
vote
2answers
150 views
What are the implications of the speed of light broken? [duplicate]
Possible Duplicate:
What would be the effects on theoretical physics if neutrinos go faster than light?
I don't know if it's been asked before, but I couldn't find a thread about it. I ...
2
votes
0answers
162 views
Neutrino path bent by gravity? [duplicate]
Possible Duplicate:
Neutrino unaffected by gravity
Other probably closely related questions here:
Link Neutrinos unaffected by gravity
Link Superluminal Neutrinos
My question is subtly ...
1
vote
1answer
100 views
What lepton neutrino would be in this reaction?
If I have a reaction (shown below), and I'm supposed to work out what the products will be, what would the lepton neutrino $\nu$ be? e.g electron neutrino:
$$ \nu + p \to $$
9
votes
2answers
88 views
Can neutrino detectors tell what direction the neutrinos came from?
I was reading this question and got to thinking. Can neutrino detectors give us any clue where the neutrinos came from or when a supernova may occur? I was unsure and decided to ask that here.
3
votes
2answers
632 views
Why do neutrino oscillations imply nonzero neutrino masses?
Neutrinos can pass from one family to another (that is, change in taste) in a process known as neutrino oscillation. The oscillation between the different families occurs randomly, and the likelihood ...
1
vote
1answer
613 views
Neutrino unaffected by gravity
Are neutrinos affected by gravity?
If not, could that be a plausible reason for a neutrino taking a shorter path than light, since light is affected by gravity?
