What is decay length in particle physics?

1. Feb 27, 2010

luxiaolei

Hi,all, what is decay length in particle physics? I could not find on web, so frustrating. Thanks alot for any helps!

2. Feb 27, 2010

Bob S

In nonrelativistic situations, if a particle has a velocity v = βc, and a 1/e decay lifetime τ (e.g., 2.2 microseconds for muon), then the distance the particle will travel before decaying is βcτ.

For relativistic particles, we need to add time dilation, so the 1/e decay length becomes βγ

Bob S

3. Feb 28, 2010

luxiaolei

@Bob S; Thanks alot!