Aim of this topic is to understand about standard neutrino phenomena reference the document of T2K(tokai to kamioka) home page. http://t2k-experiment.org/ja/
Is the third mixing angle, θ13, really non-zero?
Is the CP-violating phase δ non-zero, and if so, what is its value?
Is the neutrino mass hierarchy “normal” (mass state 1, dominated by the electron neutrino, is the lightest) or “inverted” (mass state 3 is lighter than mass state 1)?
Are there any sterile neutrino states, and if so, how many, and how do their masses compare to those of the “active”, Standard Model, states?
The neutrino is a type of subatomic particle. As far as we know, neutrinos are fundamental particles: that is, unlike more complicated objects like protons and neutrons, they can’t be broken down into smaller constituents.