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

  1. Nov 29, 2012 #1
    The problem statement, all variables and given/known data

    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...
  2. jcsd
  3. Nov 29, 2012 #2


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    Welcome to PF!

    Hi Jerros! Welcome to PF! :smile:
    Start by using the radius of curvature to find the speed. :wink:
  4. Nov 29, 2012 #3


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    Staff Emeritus
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    Or, better yet, the momentum.
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