Question: An meson decays into 2 while moving in the x direction with energy E = 5 GeV. (1) If the two s are

An η meson decays into 2γ while moving in the x direction with energy E_η = 5 GeV.
(1) If the two γs are emitted in the +x and -x directions, what are their energies?
(2) If the two γs are emitted at equal and opposite angles ±θ with x, what is the angle between the two.

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