Pion decay in electron and neutrino

Click For Summary
SUMMARY

The discussion centers on the decay process of a pion, specifically the reaction \(\pi^- \rightarrow e^- \overline{\nu_e}\). Participants clarify that \(v\) represents the electron's velocity and \(c\) is the speed of light. The relationship \(1 - \frac{v}{c}\) is derived from special relativity, where \(v/c = \frac{p}{E}\), linking momentum \(p\) and total energy \(E\). The equality \(\frac{m_e^2}{m_\pi^2 + m_e^2}\) is established through algebraic manipulation of these relativistic concepts.

PREREQUISITES
  • Understanding of particle decay processes
  • Familiarity with special relativity concepts
  • Knowledge of momentum and energy relationships in physics
  • Basic algebra skills for manipulating equations
NEXT STEPS
  • Study the principles of special relativity and its implications on particle physics
  • Explore the concept of particle decay and its significance in quantum mechanics
  • Learn about the conservation of momentum and energy in particle interactions
  • Investigate the mathematical derivation of decay rates and factors in particle physics
USEFUL FOR

Physicists, students of particle physics, and anyone interested in the mechanics of particle decay and special relativity.

mur79
Messages
2
Reaction score
0
Hi,
I have a question about this decay: \pi^- \rightarrow e^- \overline{\nu_e}
there is a factor:

1 - \frac{v_e}{c}

what are these values, v_e,c, and why this quantity is equal to:

\frac{m^2_e}{m^2_\pi + m^2_e}?

Thank you
Ciccio
 
Physics news on Phys.org
Sorry but I don't understand why the latex don't work...

the decay is

pi- -> e- anti-nu(e)

the factor is: 1-v/c

and I don't understand what are v and c...
and why that quantity is equal to: (m_e)^2 / [(m_pi)^2 + (m_e)^2]

Thank you
Ciccio
 
v is the electron velocity and c the speed of light.
In special relativity, v/c=pc/E, where p is the momentum and E the total energy.
Some more algebra is required to get the final result.
 

Similar threads

  • · Replies 11 ·
Replies
11
Views
2K
  • · Replies 13 ·
Replies
13
Views
5K
  • · Replies 11 ·
Replies
11
Views
4K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 4 ·
Replies
4
Views
4K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 5 ·
Replies
5
Views
4K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K