Decaying particle in uniform magnetic field; what was the rest mass?

Jerros
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Homework Statement

An unstable particle, initially at rest, decays into a pro-
ton (rest energy 938.3 MeV) and a negative pion (rest
energy 139.5 MeV). A uniform magnetic field of
0.250 T exists perpendicular to the velocities of the cre-
ated particles. The radius of curvature of each track is
found to be 1.33 m. What is the rest mass of the origi-
nal unstable particle?

The attempt at a solution

Wouldn't know where to start on this one...
 
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Welcome to PF!

Hi Jerros! Welcome to PF! :smile:
Jerros said:
Wouldn't know where to start on this one...

Start by using the radius of curvature to find the speed. :wink:
 
Or, better yet, the momentum.
 
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