# modern physics question..

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#### skyhawk

##### New Member
Hard to say for sure, not knowing the problem or having read your text and its notation, but it looks like the energy and momemtum (magnitude) parts of the relativistic energy-momentum four-vector. It seems to be a calculation involving (decay of?) a pion (pi meson) and a muon (mu meson) and a neutrino.

#### Hayato

##### Member
Agreed with skyhawk.

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