Literature Search

OK thanks. Using Google keywords “measuring pion rest mass” brings up M. Trassinelli et al. Phys. Lett. B, 759, pp 583 – 588, who use the 5g to 4f transition in pionic nitrogen to give the charged pion rest energy as E0 = m c squared = 139.57077 MeV. Then Google “pion momentum” to find that the decay of K+ to pi+ + pi0 gives a total energy E for the pion of 249 MeV. Finally use E = h bar omega to find that omega is 3.78 ten power 23 radians per second in the gamma ray range. This result is consistent with the fact that the neutral pion decays to two gamma rays. Also googling “pion beam” gives typical relativistic pion momenta.

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