Photon+photon -> neutrino + antineutrino ?

  • Thread starter PAllen
  • Start date
  • Tags
    Neutrino
In summary, the likelihood of the titular reaction, which carries the energy of photons away from a high density region, is extremely small and dependent on the mass of the virtual vector boson involved. Despite the low mass of neutrinos, this reaction is still unlikely due to the virtual vector boson's mass. Other interactions are much more likely at all energy regimes.
  • #1
PAllen
Science Advisor
9,186
2,421
High energy gamma rays in a region of reasonable matter density quickly produce a plethora of lower energy photons by a series of interactions, stopping when you have photons too low in energy to produce positron/electron pairs.

My question concerns the likelihood of the titular reaction (which would effectively carry the energy of photons away from a high density region). I found some very old papers discussing its likelihood in models predating the intermediate vector boson model of weak interactions. Can someone comment on the likelihood and point me at any not too advanced discussion in the context of the electro-weak theory?

[Edit: I also found good, modern, discussion of photon+<charged particle or nucleus> producing neutrino pairs. But the above, presumably less significant interaction, was not covered]
 
Last edited:
Physics news on Phys.org
  • #2
It's going to be ridiculously small. A ballpark estimate would be the rate for light-by-light scattering, times (E_gamma/m_W)^4.
 
  • #3
Is there some astrophysical context where you would get an insanely high density of high-energy gammas, but no matter? Evaporation of a microscopic black hole?
 
  • #4
Vanadium 50 said:
It's going to be ridiculously small. A ballpark estimate would be the rate for light-by-light scattering, times (E_gamma/m_W)^4.

Ok, this is the take away point. Independent of details, and despite the near vanishing mass of neutrinos, this is going to be extremely rare because it has to be mediated by a virtual vector boson whose mass makes this unlikely. At all energy regimes, other results will be many orders of magnitude more likely. But this is not a prohibited interaction, just very unlikely.
 

Related to Photon+photon -> neutrino + antineutrino ?

1. What is the process of photon+photon -> neutrino + antineutrino?

The process of photon+photon -> neutrino + antineutrino is an example of pair production, where two photons collide and produce a particle and its antiparticle. In this case, the particles produced are a neutrino and an antineutrino.

2. What are neutrinos and antineutrinos?

Neutrinos and antineutrinos are subatomic particles that belong to the family of leptons. They have no electric charge and very little mass, making them difficult to detect. Neutrinos have a corresponding antiparticle, the antineutrino, which has the opposite properties.

3. How is energy conserved in the process of photon+photon -> neutrino + antineutrino?

In the process of photon+photon -> neutrino + antineutrino, energy is conserved through the conversion of the two photons into a particle and its antiparticle. The energy of the two photons is equal to the combined energy of the neutrino and antineutrino produced.

4. What is the significance of this process in particle physics?

This process is significant in particle physics because it demonstrates the conversion of energy into matter. It also contributes to our understanding of the fundamental forces and interactions between particles.

5. Can this process occur in nature?

Yes, this process can occur in nature through high-energy collisions, such as those that occur in stars or in cosmic rays. It can also be recreated in particle accelerators, where scientists can study the properties of particles and their interactions.

Similar threads

  • High Energy, Nuclear, Particle Physics
Replies
8
Views
1K
  • High Energy, Nuclear, Particle Physics
Replies
14
Views
1K
  • High Energy, Nuclear, Particle Physics
Replies
6
Views
1K
  • High Energy, Nuclear, Particle Physics
Replies
4
Views
2K
  • High Energy, Nuclear, Particle Physics
Replies
13
Views
2K
  • High Energy, Nuclear, Particle Physics
Replies
6
Views
1K
  • High Energy, Nuclear, Particle Physics
Replies
11
Views
3K
  • High Energy, Nuclear, Particle Physics
Replies
4
Views
2K
  • High Energy, Nuclear, Particle Physics
Replies
4
Views
3K
  • High Energy, Nuclear, Particle Physics
Replies
2
Views
2K
Back
Top