Timeline for Neutrino annihilation and bosons
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 11, 2016 at 13:45 | comment | added | Adil Jueid | I agree with you concerning this. But we know that neutrinos have a tiny mass which would made the process possible. Also I was thinking about box diagrams. Thanks @Paganini for the remark. | |
| Jan 11, 2016 at 13:42 | comment | added | Paganini | A remark: if neutrinos were massless, even at higher order annihilation of $\nu+\bar{\nu} \to \gamma \gamma$ would be forbidden. The reason is related to the Yang-Landau theorem which states that spin 1 object cannot decay into 2 photons. Since with massless neutrinos, helicity is equivalent to chirality and only left-handed neutrino and right-handed antineutrino interact, the system $\nu + \bar{\nu}$ would form a spin 1 object, hence the interdiction. Now, since neutrinos have mass, there should be a possibility that the chiral $\bar{\nu}_R$ is a helicity $\bar{\nu}_L$ forming a spin 0 system | |
| Jan 10, 2016 at 21:28 | review | Late answers | |||
| Jan 10, 2016 at 21:50 | |||||
| Jan 10, 2016 at 21:11 | history | answered | Adil Jueid | CC BY-SA 3.0 |