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Yashbhatt
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According to the the definition of anti-particles, they are particles with same mass but opposite charge. Neutrinos by definition have no charge. So, how can it have an anti-particle?
This is true, but not a complete definition. There are several different things called "charge", and the antiparticle has the opposite value for each.Yashbhatt said:According to the the definition of anti-particles, they are particles with same mass but opposite charge.
Yashbhatt said:So, can we have something like anti-neutron?
jedishrfu said:
Yashbhatt said:Thanks. I did not google anti-neutrino before posting.
Is he citing evidence against Majorana neutrinos, or evidence against leptogenesis? And how strong is it? If I were you, I'd ask the responder for the specific reference.Yashbhatt said:But I think there are arguments against it being a Majorana partcile. See http://physics.stackexchange.com/questions/111358/what-exactly-is-an-anti-neutrino
Yashbhatt said:Ok. I get what you say. I just mentioned the link because I found a more detailed answer there.
He's got it right, hasn't he? Sphalerons conserve B - L and violate B + L, which is what he said.mfb said:I think you mixed + and - here. Many models propose B and L non-conservation, but a conserved B-L (which implies a non-conserved B+L).
That depends on what exactly you call SM. ExampleChrisVer said:I am not sure whether B and L can be violated in the Standard Model... in which case?
Some physicists even see it as part of the SM now.@Bill_K: Why would you need B-L violation for baryogenesis?As for the neutrino oscillations, that's not something the SM could not deal with. I guess it should be better called extension of the standard model rather than physics beyond it... PMNS is fine with doing that job.
Orodruin said:[...] Anyway, breaking B-L would be good news for the possibility of generating the baryon asymmetry of the Universe.
mfb said:@Bill_K: Why would you need B-L violation for baryogenesis?
This is wrong. The oscillation phenomenology do care for neutrino nature, a Majorana neutrino contributes phases to PMNS matrix, but it does not affect oscillation mechanism.Orodruin said:The problem with the PMNS is that it is introduced either through Majorana or Dirac neutrinos and the oscillation phenomenology does not care which.
I am actually bothered with this statement. Why would you necessarily need B-L non-conservation if you are generating baryon asymmetry using lepton number non-conservation? It is possible in principle that B-L may be conserved like it having some conserved charge for an extended gauge group.Since B+L is already broken by sphalerons which will tend to wipe out any asymmetry you create unless you also break B-L.
andrien said:This is wrong. The oscillation phenomenology do care for neutrino nature, a Majorana neutrino contributes phases to PMNS matrix, but it does not affect oscillation mechanism.
andrien said:I am actually bothered with this statement. Why would you necessarily need B-L non-conservation if you are generating baryon asymmetry using lepton number non-conservation? It is possible in principle that B-L may be conserved like it having some conserved charge for an extended gauge group.
Anti-neutrinos are subatomic particles that are the antimatter counterpart of neutrinos. They have the same mass and spin as neutrinos, but with opposite charges.
Anti-neutrinos are produced in nuclear reactions, such as radioactive decay and nuclear reactions in the core of stars. They can also be created in high-energy particle collisions.
Anti-neutrinos play a crucial role in understanding the dynamics of the universe. They are emitted in large quantities from stars and supernovae, and can help scientists study the inner workings of these celestial objects.
Yes, anti-neutrinos can be detected through a process called neutrino detection. This involves using large detectors, such as liquid scintillator or water Cherenkov detectors, to capture the rare interactions between anti-neutrinos and other particles.
No, anti-neutrinos are not harmful to humans. They are extremely lightweight and weakly interacting, so they can pass through matter without causing any harm. However, high-energy anti-neutrinos can potentially damage electronic devices.