View Single Post
Mar4-08, 04:49 AM
P: 14
Quote Quote by Vanadium 50 View Post
There is no theorem that states that particles with the same decay products have the same lifetime.

The pion lifetime is proportional to m_W^4/m_pi^5.

The W lifetime is proportional to m_W.
Thanks for all your replies.
I just thought that the lifetime of W boson, with the weak interaction decay, would be much larger, as the characteristic constant of weak interaction is much smaller that that of Strong interaction.
But the fact is just opposite. What is the right relationship of the lifetime and interacton constant?
Excuse me, I am not expert on it......