# Reletivistic particle decay

hello everybody I am new too these forums and am looking for a little help on a problem. I don't want anyone to give me the answer so i will just post the basic question and any help would be appreciated.

If an uncharged meson decays into two charged pions in the presence of a magnetic field. If the mass of a pion, magnitude of the magnetic field and the radius of the pions path are all known, I need to find the pions momenta and speed, as well as the mass of the meson.

thanks for any help!

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Meir Achuz
4. To get the meson's mass, you have to know the original angle between the two pions momenta. Then use $$M^2=(E_1+E_2)^2-({\vec p}_1+{\vec p}_2)^2$$.