Decay into an electron and an electron-anti-neutrino?

  • Thread starter Soff
  • Start date
  • #1
35
0
[tex] \pi ^- \rightarrow \mu^- +\bar{\nu_\mu} [/tex]

Why doesn't it decay into an electron and an electron-anti-neutrino? I guess it has something to do with the conservation of the helicity. But how does it work?
 

Answers and Replies

  • #2
Meir Achuz
Science Advisor
Homework Helper
Gold Member
3,529
114
The pi-->e nu decay occurs but at about 10^-4 compared to the mu decay channel. Helicity is involved. Because the pi has spin zero, the two decay particles have to have the same helicity (giving total S_z=0). But the V-A theory of weak interactions tries to give them opposite helicities. This mismatch leads to a factor (m_e/m_mu)^2 in the ratio of e to mu decay.
 

Related Threads on Decay into an electron and an electron-anti-neutrino?

  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
14
Views
4K
Replies
6
Views
13K
Replies
19
Views
12K
Replies
2
Views
1K
Replies
2
Views
2K
Replies
22
Views
4K
  • Last Post
Replies
10
Views
5K
  • Last Post
Replies
3
Views
8K
Top