Lifetime is the average time between creation and decay of a particle, which cannot be predicted for an individual particle, so we use the average time. The lifetime is the time when e^{1} (or 37%) of them have survived. Derivation of equation
To simplify calculations, we will use only the information in a plane perpendicular (transverse) to the beams, that is, in the xy plane.
The lifetime of B mesons is
(Do you find the usual formula for p if v is much smaller than c?) 
You can solve this and find
(You will need to use this form when you are using length measured in cm.) 
Run 
Event No. 
B Mass 
p_{tB} 
d_{t} 
Velocity 
Lab Lifetime 
Rest Lifetime 
Bin 
65160 
642324 
5.277 
7.966 
0.388 




66500 
89978 
5.274 
20.508 
0.940 




Get the data.  Help with data analysis.
B Lifetime Graph » 