Recent content by Xia Ligang

Mass eigenstates correpond to diagonal elements in "free" Hamiltonians, while flavor eigenstates to diagonal elements in the "interaction" part. Could we combine mass eigenstate and flavor eigenstates to construct an eigenstates for the "whole" Hamiltonian? Maybe I go back to the beginning.

I think it is just for simplicity.

“... The flavor states are the superpositions of mass states which have charged current interactions with the respective charged leptons. ..." Here I have a question. Which states have charged current interactions, flavor eigenstates or mass eigenstates? If we use the former one, it is OK...

We don't detect neutrinos because the cross section is very very small. It is easy to detect electrons as they have charges. But when dealing with neutrinos' oscillation, we have to detect neutrinos directly using for example inverse beta decays. What neutrinos are produced in the muon decay...

As we can change the orientation of an intrinsic spin, but cannot change its magnitude, it is likely that the magnitude of "intrinsic" moemtum is invariant, but its direction could be altered. If "intrinsic" momentum possesses this property, we can extend the perception of mass. A scalar "mass"...

Here you have to understand the process of muons' decaying. Muon has a meanlifetime. It can decay at any time, which is a poisson process. With some calculation, you will find that the time interval between a muon stopping and its decaying abide by an exponential distribution. Fitting the...

An idea bursts into my brain. Could intrinsic momentum be the "mass"? You know, they are nearly the same from the view that E square is the sum of m square and p square. Maybe by introducing the intrinsic momentum, we could find some relations among the masses of all particles.

Neutrinos have no charge. What happen if C operates neutrinos? I think it deserves thinking over. Maybe we should extend the perception of anti-pariticles.

I think it is correct. If we denote neutrino mass eigenstates as vi, muon could decay into each vi with different lifetimes. But as neutrinos' masses are so small that present detectors can't distinguish the differences of each decay modes. So we measure the average decaying lifetime over all...

It is aslo hard for me to understand their exact meanings. "flavor" eigenstates label their roles participating in various interactions. For example, W bosons couple electron with electron neutrinos, not muon neutrinos. And "mass" eigenstates determine their evolution with time. But still, it is...

As far as I know, it is impossible to detect the W bosons directly so far. In pion's or muon's decay, it could only exist for a very short time. You can estimate it according to the uncertainty relation.

Weak interaction is a V-A theory. Through calculation, pion decays into muon nearly 100 percents. It could decay into electron, but the decaying rate is very small. Then muon decays into electron.