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dreamspy
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Homework Statement
We have the decay process:
pion --> muon + anti muon neutrion
How long does the muon travel before it decays? (the pion is stationary before the decay)
The answer is supposed to be
d = c * t (m(pi)^2 + m(mu)^2) / (2 m(pi) * m(mu) )
where t is the mean lifetime of the muon in it's center of mass system.
The Attempt at a Solution
Now I know about the conservation laws of energy and momentum.
Also from the form of the formula for d, I see that we should have d/t = v , where v is the speed of the muon. The speed is related to the momentum by p = mv. So I should try to find the momentum p of the muon. Now I say that the neutrino is massless and define the change in rest energy to be:
delta E = c^2 ( m(pi) - m(mu) )
This energy should then give the muon and the neutrino some momentum and kynetic energy. So I should use the conservation laws to find p and then the problem should be finished. But I haven't been able to show this. Anyone have any clue how to do this?
regards
Frímann
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