(e) If the photons travel along the y axis, determine the 4-momenta for each one

Question

(e) If the photons travel along the y axis, determine the 4-momenta for each one.

(f) Using your answer to (e), write the 4-momenta for the photons if they travel along the x axis.

(g) Transform your answer to (f) to a frame where the pion is moving at 0.8c in the +x direction.

One of the decay modes of the no produces two photons. mpi0 = 135.0 MeV/c2 mean lifetime = 8.4x10-15 s The pion is moving at 0.8c in the +x direction relative to the detector in the lab. (e) If the photons travel along the y axis, determine the 4-momenta for each one. (f) Using your answer to (e), write the 4-momenta for the photons if they travel along the x axis. (g) Transform your answer to (f) to a frame where the pion is moving at 0.8c in the +x direction. N0 = gamma + gamma

Explanation / Answer

One method is based on the conservation of angular momentum.

The electronic transition must follow the selection rule ?l=

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